More likely than not, for the average Steinway in a store, the technician will suggest getting it voiced and regulated, which will carry a $1000+ price tag and a couple days' worth of work. Maybe that doesn't matter if you're already spending $200k, though.
The construction, however, does have a lot to do with how repertoire sounds. Bosendorfers and their all-spruce construction causes more warmth and resonance, useful for traditionally played baroque music, but can lead to a blurriness in romantic (i.e., Chopin-era) music. Contrast with a Fazioli or Steinway which have a little bit of a tighter tone due to their hard rim cases.
I'll preface with by saying that I know very little about pianos but I love them for all their mechanics.
I've heard it said that if it were possible to get the action feel equal across all the keys, the manufacturer would. But your comment makes it sound less like a bug than a feature. Is it because people have just gotten used to it as an expectation, or because there is an inherent advantage?
(I'm assuming your statement about "heavy" keys was meant as a comparison between models and not a comparison of keys on the same piano).
But maybe that's just me.
That's not a problem at all, since that's exactly what you should be able (and only you) tell yourself!