Musician or Musician?

Ok, weird title i know. I'm going to state an observation then ask your opinions after a brief bio of sorts.
First off, my sole instrument is Electric Bass, been playing since i was 12 and im now 50. I'm not trained, had very few lessons just recently, know some theory, been in teen bands etc. and currently play P&W.
I play and learn by ear, though in P&W lead sheets, chord charts are the norm. I first learned and played Bluegrass then moved to C&W yes back in those days it was called Country and Western, then i played rock when i was about 14-15 hitting the teen dance, party, school function stuff. Around 18 or so i turned to R&B and Funk, but in my area a blonde blue eyed funk bass player wasn't too well sought after; so i hung it up around 26-27 yo and didn't touch it again for about 17-18 years. Fast forward to now, i love to still play Funk and R&B but also love some Progressive Jazz and Fusion mixed with the Smooth Jazz sound. My style reflects all this Funk and jazz also. I do not consider myself a "Bass Player" i do believe i've earned the title of "Bassist".
Anyway, heres my observation (inspired by the 'do you get paid thread').
I've played with some above average musicians in my days, but what gets me and i'm thoroughly baffled and perplexed by it is; the trained musicians...sight readers, degreed, highly regarded types, that can't play a single note without the sheet music written out. I've encountered this "phenomena" often here lately and it makes me feel sorry for these people. How can you be so trained and so good on your instrument yet can't improvise? Granted i can't sit down play by reading, but i can improv with what i hear at the time i hear it. (mostly) These people i've seen just completely stop and say "i can't' because the music isn't written any farther.
What's your take on this?
First off, my sole instrument is Electric Bass, been playing since i was 12 and im now 50. I'm not trained, had very few lessons just recently, know some theory, been in teen bands etc. and currently play P&W.
I play and learn by ear, though in P&W lead sheets, chord charts are the norm. I first learned and played Bluegrass then moved to C&W yes back in those days it was called Country and Western, then i played rock when i was about 14-15 hitting the teen dance, party, school function stuff. Around 18 or so i turned to R&B and Funk, but in my area a blonde blue eyed funk bass player wasn't too well sought after; so i hung it up around 26-27 yo and didn't touch it again for about 17-18 years. Fast forward to now, i love to still play Funk and R&B but also love some Progressive Jazz and Fusion mixed with the Smooth Jazz sound. My style reflects all this Funk and jazz also. I do not consider myself a "Bass Player" i do believe i've earned the title of "Bassist".
Anyway, heres my observation (inspired by the 'do you get paid thread').
I've played with some above average musicians in my days, but what gets me and i'm thoroughly baffled and perplexed by it is; the trained musicians...sight readers, degreed, highly regarded types, that can't play a single note without the sheet music written out. I've encountered this "phenomena" often here lately and it makes me feel sorry for these people. How can you be so trained and so good on your instrument yet can't improvise? Granted i can't sit down play by reading, but i can improv with what i hear at the time i hear it. (mostly) These people i've seen just completely stop and say "i can't' because the music isn't written any farther.
What's your take on this?