I do find it easier to play fretless, yes. Not for tapping, though back in the 90s I did woodshed to the point that all the tapping I was doing, I could do on fretless. Haven't tapped or slapped much in the last 20 years though. But I play fretless very nearly exclusively. I don't currently own a working fretted bass (I have a couple that are taken apart currently). I struggle when I switch back to fretted until I get used to the "speed bumps" again. And then when I pick my fretless up again, it's like I've come home.