I think Yamaha had to have enough arguments to justify a purpose of SX700/900, so they made a small change (as I understand, the same keybed was used in MX49/61 years ago), but they used that light keybed for years because it was actually just fine, it just takes time if you are moving from something different - yes, at first it's rather uncomfortable.
Kabinopus, I completely respect your use of tact, and decorum. I believe you are a true gentleman, and your posts reflect your respect for others. I, on the other hand, while not a bad person (shhhhh) do "occasionally" come off as unfeeling, or judgmental because of my directness. I'll try to follow your lead, and buffer some of my initial thoughts before I post. My Dad is a master of tact, and humility, but but I got his weak eyes, and failing prostate, in stead of his calm demeanor, and quiet wisdom.
So, on the subject of what I called "crappy keys" ...
Of course, I am just one of many I know, who are less than inspired by the short key throw, and flimsy feel. My musical teeth were cut on a Rhodes for years, and then the more substantial Roland, and Korg arrangers of the past. I watched as the keys were gradually degraded ... probably to cut down on weight, and aim the product to a more casual demographic, but as a guy who literally sings for his supper, I always felt that the combination of drum machine, monitor speakers, and good staple sounds in an ALL IN ONE box was the smartest choice for my work. The key feel has been a shortcoming for many of the new choices made available to us. This new Yamaha represents a real breakthrough to the working musician who needs to "dig in" sometimes, and get more expression from the keybed. My style of play is primarily chording with my right hand, and as such, I need to vary the velocity, and intensity quite often. No PSR to date has given me that result. The Tyros series, has great sound, and feel, but .... no speakers, and EXTRA large. Not a good fit for me.
I Love my $X for everything it does, but again ..... silent slab. Not ideal.
I patiently await the arrival of my sx900 to see if the combination of upgraded keys, touch screen, and chord looper are indeed ,the game changer they seem to represent for me.
Again, thanks for the reality check - always love your posts, and your playing. I wish we were closer neighbors.
Ciao, my friend. ( I know ... it's Italian, not Russian, but hey - my mamma is from Italy)