You're comparing something that costs $35k and needs constant maintenance with something that costs $3k (adequate) and $10k or so (top end) and requires almost no maintenance at all.

Add a $15k studio monitor system to a $10k sampled weighted-action piano and it's going to sound pretty decent.

Actions are getting better all the time - although manufacturers are worried about competing with their own premium products so they tend to cap the action quality on electronic ranges.

And for comparison, modern $10-15k baby grand acoustics tend to sound a bit crap too. You get all the non-linearities of a shorter string length with a so-so action. And they're rarely kept in tune and maintained properly.