Sorry, but I think "key feel" problem is not the more important problem in Yamahas keys, but the second one.

Yamaha's key feel is bad, of course. It affects feeling and sensitivity you put in your rendition, but it doesn't make errors in playing.

But it is not the most important bad thing.

The worse one is that Yamahas keys are SMALLER. That is, from a C key to next C key, distance is shorter than any other kb, and any piano.

If you play without to see keys, if you make chords without to see the keys, and you are used to play not yamaha keyboards or pianos, smaller octaves in yamahas may be a great problem for your hands: you are going to play wrong keys because your hands are used to play another octaves distance.