The answer in regards to not wanting account-wide reputations was highly unsatisfying. Don't the devs realize how insane it is to try to farm all the reps in the game on individual characters when they have reps like Shaohao, Bloodsail Buccanears, the Vanilla PvP rep titles, and so forth? Heck, I know of one rep grind from WoD that is impossible to do because of the removal of Ashran, and I can't even use the coolest looking Alliance tabard on any new character because of it. Let's not forget that the rules for what is account-wide or not from reps make no sense. Several cosmetic rewards that are locked behind the reps that you need to even use on an alt, yet this rule does not even apply to stuff like mounts, which makes it all highly inconsistent and stupid.
I've been practically married to my original Vanilla Paladin because the rewards on her are irreplacable and it would frankly be asinine to do them all over again. Reps that are Exalted should frankly all be account-wide, period.