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I have found no need for flavor either. The rub and sauce is all the flavor I need and can't taste the injection after sauced anyway from my experience...then again more than 1 way to do pretty much anythingMy vote is for no injection. Plenty moist if cooked correctly and then sauce adds more moisture afterwards. Just my opinion.
I inject my turkeys I fry the night before. FWIW
You are correct that injecting isn't necessary for moisture, I inject to help with the flavor I want the meat to be. I like to add apple juice or cider with some rub to inject with. The pork taste better to me. IMHO.