Reasons against practicing insight meditation as a main (sitting) practice for medical or other recondite-subject majoring students? ("Recondite-subject majoring" is meant to mean the more challenging subjects, such as electrical engineering or a doctorate based major.)

If a student who has one hour to meditate, every day, and one more hour on the weekend, will practicing an insight meditation be counterproductive to concentration and calmness? The main aim is to be a better student. [This purpose may seem narrow minded, but I do not know where else to ask this question.] This question sprung from a recommendation: 


  Although what I am about to say may cause some amount of sensation to
  arise in people who are attached to their insight meditation
  traditions, I would advice, from my personal experience, that you
  don't practise insight meditation exclusively (the anapanasati
  meditation that I recommend is not an insight meditation, it is a
  calming meditation) since it will cause many troubles, especially
  in a student life like ours. This is because exclusive practise of
  insight meditation will initially cause many defilements to come about
  (although the goal is the contrary) - for example, all kinds of
  craving will come about. This is not conducive at all to a successful
  student life.
  
  You can, however, practise [sic] insight meditation during daily life
  (rather than the main meditation practise) such as while walking and
  eating and so on, without getting into much trouble, ASSUMING that you
  have a solid practise [sic] of Anapanasati going on.


Does not insight meditation, such as Vipassana, involve anapanasati in the beginning? It just feels counterproductive to go back to doing anapanasati only for the hour available. Actually, it just seems hard to do that. (There may be a sort of attachment to the body scanning technique happening here?)



Research


Toward the integration of meditation into higher education: A review of research ~ What specifically are mindfulness-based interventions? What is a specific technique for a student (beginner)? Most importantly, is "mindfulness-based" the same as "insight" meditation?
Meditation, social change, and undergraduate education ~ authors informal attempt of Zen in group sits (no real help)
[Other studies will be listed in my answer. It is getting too lengthy here.]
I did my first longer vipassana retreat while I was a postdoc researcher (applied math and numerics), and did many more since then. I found it beneficial to have days/weeks dedicated for intense practice (which are tough, but you're in a protected environment) and then off-retreat time for work &amp; other stuff. After retreats, I was mostly much more creative in work (especially after the first one; I finished within weeks papers I had been  writing for months), as retreats remove a lot of negative conditions which we carry around. Sometime there were difficult post-retreat states, true, but you want to learn to face those as well.

I would not be afraid that light (1 hours and such) daily practice will cause some substantial trouble in your life; it's more about seeing stuff which is happening anyway. If you have a competent teacher, he can help you to adjust your practice if you think there is some difficulty.

That said: if you have some serious psychological condition, don't forget to take care of it along the way, using also conventional means (psychotherapy, medication) as necessary. Traditional 3 Buddhist trainings are (1) personality (they call it "morality", but it is really about having a stable psycho-social basis, as I understand it) (2) concentration (3) insight; and the first one has to be strong enough to support the other ones.

Vipassana (=3) as such does not imply separate concentration training (=2). Some schools do that (e.g. Goenka which you seem to mention implicitly -- anapanasati, then bodyscanning) but the "dry vipassana" approaches (Mahasi and similar) don't; you do vipassana and build up concentration along the way.

Being a dry person, I personally do the dry vipassana. It is very important to include all 4 foundations of mindfulness (body, feeling, mind, mind objects) in the practice. High concentration is not necessarily good; I was depressive for years and had terrible (though successful) life as a result of being very concentrated and pushing stuff away without even knowing that. In fact if you are doing PhD, odds are that your concentration is rather high. You maybe hope that if you concentrate more, you will be more successful; maybe, but maybe you won't be very happy, and maybe you will run into burn-out. It is important to be flexible with concentration (to be able to release it), to not become its slave. Concentration sometimes causes people to be excessively serious.

PS (added): "Mindfulness-based" is sometimes used to refer to secular contemplative approaches often based on vipassana, such as MBSR (mindfulness-based stress reduction), MBCT (mindfulness-based cognitive therapy) etc. You will find both mindfulness/insight meditation used as translations of vipassana (meaning "seeing distinctly/clearly"); I personally find "insight" more appropriate, since insight is the goal and mindfulness (sati) only the means, though mindfulness might become prevalent, sounding perhaps less mysterious...