Only point I got was the one about most user music having the RH sounds nearly drown out the accompaniment...

I must say, I keep posting about this. With as cheap as recording equipment is, with as advanced as the arranger 'capture' systems (whether audio or MIDI) are nowadays, there's really NO excuse for putting out stuff that obliterates that accompaniment. Simply record yourself, listen to the music as if you were listening to a CD or live band, and listen to the music as if you were one of the players in the band (not the soloist). Can you hear yourself AT ALL?

Chances are, no...

So you go back to the registration, turn down all the lead parts, and record again... NOW does it sound balanced? OK, 'write' the registration. Rinse and repeat. After doing this for long enough, you MIGHT finally get used to hearing yourself WITHIN a mix, rather than on top of it. If you don't, you are doomed to make the same mistake forever, as witnessed by most of the Youtube stuff out there.

It's not ALL about you...