I've been following the present discussion between Michael Brazile and Claudio Di Veroli with great interest because this whole idea of "le bon gout" has been going round in my head for some time. 
I find myself agreeing with both of you! In order for our composers to "move" us we need all the mannerisms of their time. And the greatest joy can be found in trying various amounts of "inégale" , "suspension",  playing a mordent, for example, more slowly or faster.
Simply playing the music "as written", perhaps even leaving out the ornaments, just makes it boring. I think that romantic piano music, too, has to be played with discipline, i.e. correctly  but also with suitable rubatos, accelerandos, crescendos  etc, i.e. with all the "mannerisms" of its period for it to touch our feelings. It would be a poor pianist who did nothing but get all the notes right! A machine can do that.  But the basic question still remains:
What is this good taste? I feel there are many answers -  and that's great!

Best
Ph.

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