Interesting about Steinways not being what they used to be. That piano technician repeated several times how they are hand-made with the most carefully chosen wood (grown in only two places in the world just for their pianos) etc... And that you cannot compare factory-built piano manufacturers (Yamaha) to the hand-made Steinways. Of course, he works for Steinway. My piano is a Yamaha C2 grand and my piano tuner raves about how well the Yamahas hold together, easy to tune, etc...
I've wondered about the Shigeru Kawai, but have never tried one. Maybe I'll go piano shopping again one of these days. (don't tell my husband
As to voicing, you are right. I bought my piano brand new and in the piano store were a dozen grand pianos in a row. Six or seven of them were the exact model but sounded much different from each other. I picked out the one that fit my ears best, and that's how I ended up with a Yamaha. But just three weeks ago, I noticed that some keys were sounding more harsh or maybe the word is 'bright'. It was getting on my nerves so I asked my tuner to fix them. Argh, can't think of the word for this one either, but now I know what it means to have some hammers 'adjusted'? or maybe it is 'voiced'? Anyway, he had a metal pointed rod that he used to gently scrape the felt on the hammers, so as to soften them and make the tone not sound harsh. I think I will try to do that myself next time I notice a bad tone, as it didn't look hard to do.
Use a very fine needle, a lancet works well, just don't overdo scraping or poking; once the hammer is softened, it takes a very long time to re-harden, so do any correction very gradually. Also be careful not to rip off the hammers when moving the action.
There are a couple hammers on my piano that need some softening every year or two. I make a series of shallow pin-pricks with a superfine insulin needle along the grooves in each offending hammer. However, I strongly suggest you get professional advice first. From what my technician tells me, it's easy to do some damage.