This might be off-topic as few people would say that playing bowed instruments is easy, but it’s relevant to your point.
Cello is by far the hardest instrument I’ve ever learnt (the others being guitar and piano).
Just getting a nice, reliably in-tune note out of it takes years of daily, frustrating practice. On the best days, I could play a recognizable melody more or less correctly. On the worst days all I could get out of the instrument were the last moos of a dying cow.
But that’s not even the worst thing about it.
The real problem is bowing, and nobody realizes it. Apply too little pressure and you get a sound that is described in professional terms as “a mosquito fart”. Apply too much pressure and you just get loud and creaky noise. More importantly, bow grip and the sideways wave movement going from the wrist to the elbow then the shoulder and back feel absolutely weird. I mean how often do you do something that looks even remotely like that in real life ? Bow mastery is a lifetime’s study.
I’m just an OK pianist, and I was never a great guitarist, but the cello is in a completely different league.
