Just seems a little nit-picky to me. I can't help thinking there are more important things to implement than little gaps around letter descenders and configurable line thickness in text underlines...
I really need to vacuum my car, but maybe I should hold off until we resolve the Ebola outbreak?
EDIT: But sure, the fact that there are other things to do doesn't mean no one should worry about anything else. I just feel like this is one of those things that doesn't really make any meaningful change, add any value, etc. Like I said, just seems like nit-picking. To each their own.