The ability to do something does not make it a good use of capacity.

Capability is not a reason. You can do many things well, and the world will happily fill every hour of that capacity, because competence attracts requests faster than it attracts protection. The question is never whether you could, it is whether this is the best use of a limited amount of you.

Next time you are asked for something you can obviously do, pause on the capacity question instead of the ability one. Being able is a fact. Being the right use is a decision.