Would like to see the exact models and price tags and understand what you think I can't afford.

There are no price tags and models because these things are build from scratch per project.

If you can't afford to hire a contract EE, FPGA and acoustics engineer for two weeks + parts you're getting shit.

Dude, that's not an argument and not how you discuss things.

You need to at least put a link to some article that says someone built it, and other pianists agree it can replace both the ACTION and the SOUND of a piano. Oh, it should weigh about 100lb, not 500lb.

(And if such a thing exists, why wouldn't it commercially be available so that everyone can buy it? Plenty of people include me would want it. Why wouldn't Yamaha or Roland build this 20 years ago, as if they don't have the resources for that?)

Also, looks like your comment only focuses on the sound part of it -- if real at all -- and ignores the mechanical part of it. That's a big no.

Before seeing more evidence, I'll just assume such a thing does not exist.

Source: Trust me bro.

There is the kawai novus5 which is a digital piano with the action and soundboard of a real upright piano and enough speakers to sound almost exactly like a real piano. There are also some new roland models I haven't tried. Many dealers lump these into their acoustic piano offering and don't market them differently because they are that good.

See https://m.youtube.com/watch?v=4DaaafyAUqA and https://m.youtube.com/watch?v=oLsPK2ATJcY. He is a pianist and he bought a novus5 to replace his own upright piano...