[SAI_Peregrinus]

I have a clear fountain pen. It solves most of the issues. It can still get lost, but because it's more expensive than a disposable I'm more careful with it. If it stops working it's probably clogged, the nib is easy enough to wipe off to clear the clog. If it's really bad an alcohol swab might be needed. It's clear, I can see the ink level. The "scribble before use" thing is because ink on the ball dries out. Not so much an issue when there's no ball.

And of course there's the classic issue of people stealing your pen, but most people don't know the technique to write with a fountain pen so it rarely gets borrowed.