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Wait, I'm confused. 
This sounds like you're saying everything should be planned out, but then you give examples of how the plot adapted from the original plan in a show you really like.
So which is it? >

See that I misspelled the title? Did I do that with a purpose, or am I a hypocrite? >

This is only unpopular with studio executives >

Would the show have been as good as if they did kill Jesse in the first season? How would they keep the show going? You have to adjust things for a TV audience vs book audience. >

So your example to back up why you are correct is to use one of the highest rated series of all time, and to say it should have been done differently? 
Knowing the whole thing is not what makes a great story. Especially with a series, the character you write on the page becomes something else when an actor takes it over. The Jesse written on the script developed as a character on the screen, so the same decisions no longer were the best story. 
Also from a practical standpoint, say you get commissioned for a series. You then have to write 8 series before the first comes out, then its a flop and get's cancelled before series 2? You'd get worse quality writing if that was the case because everyone would be rushing through the other series to get their's made.