What you are missing mouse, is that longbow has 96 base accuracy right now. I used a MW Longbow until the heirloom theft, that had 98 accuracy. With 6 PD and some 160-170 wpf... it really wasn't that accurate. Even with 99 or 100 accuracy it wouldn't be nowhere near accurate with 7 PD at lvl30 or 31. You can only boost the stats so much.
Ideas are interesting, of course, but would be a fucking pain to balance, i imagine. And i really am not sure if they would ever get balanced better than they could be with the current system.
TBH, archery was at its best balance before the arrow damage buff. Perhaps some buff to bow damage would have still been okay to please some of the complaints. Arrow damage buff is what makes the longbow as crap as it is right now, relative to other bows.