Violins with steel strings usually have fine tuners, those with nylon or gut strings seem to do just fine with the friction pegs. Nylon/gut seem more forgiving than steel, since steel has very little stretch. A slight turn and steel jumps from flat to sharp. But a big part of the tuning problem is experience-we get good at what we practice. In time, I believe any player can get the feel for friction tuners. I eventually got pretty good with the 5th string peg on my first banjo, but over time it would loosen and need the screw tightened. After a number of years I had had enough of not knowing when it would jump out of tune and had it replaced with a geared peg. Violin pegs are tapered to fit a tapered hole, 5th string pegs on a banjo are straight, and require tension on the knob to stay in place. They are a lot less stable than tapered pegs, in my experience. Try the peg compound and see if that helps.
I can't recall seeing fine tuners on a fiddle, just on school violins. Any fiddlers care to comment?
Paul

I learned lots of great hymns, though.
And I wish I could dance. Maybe someday!