Have only read the OP and none of the replies (no time!!) but I agree- give me any bass or amp and I'll sound the same. I have very much enjoyed my journey finding gear nirvana bit I bet if you A/B'd my tone now and 5 years ago there wouldn't be much difference... probably just I now have an amp which gives me that tone with very minimal EQ
Oh, btw, my sound is "sh*t bassist"
EDIT: as for the theory and practice, I did A Level music, lots of grade exams on bass, trombone, piano, French horn... Would like to think I know some stuff, however I'm well aware of my limitations and have many plans to study and fill those gaps in my knowledge/talent. Time however is very precious with a 2yr old son...