Chopin is unusual in that he wrote almost exclusively for the piano.
> As practice gradually moved away from this insular model, and standing, virtuoso quartets replaced ad hoc groups as the chief vehicles of chamber music performance, Beethoven’s compositions became increasingly experimental (and daunting). Legend has it that when Ignaz Schuppanzigh—a well-known Viennese violinist and Beethoven supporter—complained about a particularly difficult passage in one of the Op. 59 quartets, the master retorted, “Do you suppose I am thinking about your wretched fiddle when the spirit moves me?”
If you write a piece that a player struggles to play, that will sometimes come through via a muddled and strained performance. There are famous exceptions that prove the rule on this, such as the extremely high register opening bassoon passage from Rite of Spring through which Stravinsky intended to convey strain, or the trumpet squeals of Ray Nance at the end of many Ellington arrangements.
Generally, though, you want the players to be able to play your piece well. And "err on the easy side" is an effective way to do that, especially when writing for instruments you aren't personally an expert with.
Wiki entry on his teacher:
https://en.m.wikipedia.org/wiki/Wojciech_%C5%BBywny#:~:text=....
I bow to your superior knowledge, just want to add for the poor shlubs who are even dumber than me:
Chopin was not simply a composer, but a virtuoso piano player, and i guess because of that he wrote what he wrote for the piano; in contrast to say Mozart who performed at the piano but mostly composed for orchestras, etc.
And the periods of time were different wrt, when Chopin was active, Mozart, Beethoven et al's music innovations already existed, along with larger audiences to play for, which created Chopin's niche
or something like that, i'm not a music guy