There is a subtle but very important difference.

Many Vat II minded people are willing to respect that some people may prefer pre-Vat II style worship. (So recognising it is a strange but legitimate choice)

But it seem to me that there is a solid core of pre-Vat II minded people want to say that Vat II is heretical ... (So saying it is an illegitimate choice.)

So pastoral openness to certain people who prefer the style of the pre-Vat II Mass is, I would say, generous. 
Whereas ...