That definitely works to create character depth supported by the mechanic. I may have to try that one

My houserule has always been:

Base skill points @ level 1 + INT bonus (if applicable)
= number of skills. Player chooses that number, and those are now your class skills.

This allows for the fighter affiliated with the thieves guild to have “picked up” a few tricks.

Or the Wizard with a passion for clockworks, that knows mechanicals inside and out.