I don't mean it as vibrato...I meant the "mechanics" of vibrato . Simple concept , comparable to your test....try to keep up , I'll go slow....rocking your finger back and forth in a rolling motion"AS IF " without actually taking your finger OFF the fingerboard. If you CAN"T here a pitch difference then you OBVIOUSLY DON"T have good pitch. If you can't notice that you are both slightly flat and slightly sharp when doing this, then I don't know what you've been doing on a fretless since 1970.
Your statement of being off with your intonation "slightly" and no one will notice may be true for YOU and if it is then there are many good ear training courses out there. So if a luthier is off with his fret placement then "no big deal"cause no one will notice! There is BAD intonation which is VERY different from playing jazz improv in a club with other musicians where at times a player may be off and it sounds GREAT ....but don't try to convince me that no one will notice. I don't care how long you've played fretless, that means nothing to me ....Ive been playing it just as long and have studied with one of the most unique ,well known fretless players there is.
I'm not going to derail this post anymore by arguing with someone who just wants to argue for the sake of arguing. You can always pm me if you want a real discussion....same for the other guy who can't read....I never said anything about what you can do on fretted you can't on fretless...I mentioned a few techniques that one does on fretless that aren't possible on fretted, and some that don't work as well...He obviously got that one backwards as well. If you want to troll then have fun, I'm not going to entertain it.....PM ....but I expect the several posts I'll get hear from you guys that I won't address.