Indeed. Many moons ago, I helped out a youth orchestra based in West Sussex. The man behind it was the head of music in the County.
He was a cellist and could read anything put in front of him, faultlessly.
One day I was noodling on an upright bass and asked what I was playing. I just said I was just improvising something and he was completely stunned that I could do that. A weird situation in which each of us was in awe of the other.
I wouldn't really know the answer to the last two (as a number). For the music I play, the answer would seem to be 10 for each but I doubt the guys in the Mavanishu Orchestra would agree!
I ordered one of those 1983 reissues when they very first came out. I remember it was delivered just before a fire drill at work. They weren't impressed I took it outside with me.
I sent it back because I couldn't live with the awful replica tort plate.
I have played a fretless, on and off, for about 40 years. There have been times when I haven't owned one but now have 2, with my SUB Stingray about to be converted to fretless, with a new fingerboard. That'll make it 3.
A brilliant deal for someone wanting to go digital. It has been revolutionary for my band, and improved the sound as much as it has simplified our set up.
This is a step up from our Behringer, but the principles will be the same.