I know that's an opinion but it's actually wrong. It's the first and only opinion ever that is actually wrong.
The piano in particular. You have 2 ways of alternating the sound you make with a piano: you can "hit" the keys harder/ softer and you can use the pedals for some phrasing (staccato, legato). That is actually the main reason why the piano sucks, because it has so little user control.
And you're completely skipping over some key facts; there are numerous string instruments that are amazing (the harp is magical). And the Clarinet is actually the best instrument ever and there are records that God gifted the clarinet to us in the 15th Century because he felt sorry for us because we hadn't discovered its perfect qualities yet.
But to be serious; with a clarinet/ oboe/ woodwind in general (this is partly true of strings, but not the violin because the violin sucks) I can completely alter the way a piece sounds or is played just with my throat, I can also change that with my tongue and mouth, and even more by how much air I use, how hard I grip the reed, how I finger the holes, how I rest my fingers just above/ far above, what angle I raise the clarinet to. There is actually so much more I can do to change it, which really brings in a whole other dimension to it.
And that's another reason why the piano is bad. There are some very good things about the piano, but it's a mixed bag.