I've had a Canon 10D now since 2003. Haven't used it much as it's not waterproof.
Anyway I was asked if I would sell it. Looked at what it would fetch and decided to keep it. Asked if it had the functions found on modern kit I had to admit that 'no' it really is a bit ancient for that. Auto ISO was mentioned and how handy it is for some occasions.
After the fella left me I started to fiddle with the controls. Put a 40STM lens on it and put it into green box mode - you know the one nobody want's to admit using Well I tried to alter the ISO and it came up 'ISO Auto' on the top screen! So Canon has had Auto ISO since 2003? Never knew that.
Another thing too; the flash in green box mode works extremly consistently too.
There, I've admitted to using green box mode so does that make me a beginner once again?