The abilities are really not the problem. It is how they are written into the backgrounds.
If the adventure has a coffinmaker, I just want a line of text that reads: Because he knows how it is to be looked at by higher people, the coffinmaker is helpful towards adventurers with the following backgrounds: urchin, folk hero, criminal.
So now it is written in the right place. Right where the DM can see it whem they read the adventure.
Also in the DMG there can be general advice how to itilize each background when designing their adventure.