I had to pull one of my toilets about three years ago and went with a waxless ring. Much prefer it over a wax ring.
Same here . They last forever IF they aren’t moved around. Trouble is those [censored] hold downs corrode away and first sign is just that , wobbling around. That may or may not make it fail. Do yourself a favor , if it leaks at all replace with rubber and kick that 19 th century technology to the curb. Also use hi grade brass or stainless hold down hardware, don’t be cheap. You’ll thank yourself later when you avoided yet another [censored]

job. The builders grade hardware they OEM are always pure garbage.