Well, tastes obviously differ and you don't have to like Bach...I'm kind of a math nerd and love the structure of contrapuntal music.
Regarding lack of "room for interpretation", I've found plenty in Bach. That said, the three Partitas recordings I currently own (Schepkin 1, Tipo, J. C. Martins; Schepkin 1 the favorite) all feature quite a bit of embellishment or "extravagance". Schepkin 2 supposedly tones down some of his earlier embellishments. (Other Bach solo keyboard performers: I own quite a bit of Gould and Schiff on piano, a Feltsman Art of the Fugue on piano, a Feinberg WTC on piano and a Hantai GV on harpsichord. Plus various recordings by those previously mentioned.)
I recently read a review of a Morton Feldman recording in which the critic expressed the opinion that Feldman's piano music allows relatively little "r f i" and that recordings don't differ very much. I don't agree, but the dynamics (often pp to ppp ) tend to obscure differences.
I've attended a couple of performances of Steve Reich's music recently, and he seems like a composer who might truly leave little "r f i", because the phasing has to be executed so precisely. But I haven't heard all that much Reich.