I think the worst change made on the PTR was moving a lot of the rep from the world quests to the rares, it has really made the reputation rates feel terrible, too. According to wowhead it went from 225 rep to 100 rep, and now rares grant you 15 rep. So while the total rate of acquisition actually (in theory) went up, you need to do a whole lot more work in order for the math to go up - because killing those 29 rares is going to take a lot of time and patience. You could argue that “it only rewards 15 rep, so you don’t need to kill all the rares”, but you also don’t need to farm most of this reputation in the first place.
Perhaps a controversial opinion: I don’t really think it’s bad that rep is daily capped. I do feel for the players who aren’t able to play every day and perhaps instead go hard on the game once or twice a week, but I don’t necessarily think reputation needs a catchup mechanism. This is largely because I do not think that reputation should reward anything that warrants a catchup mechanism in the first place. At least at exalted, revered is more debatable, but I think there had ought to be some forms of reputation boosts beyond simply doing daily content; such as more rep from the quests/campaign, and weekly quests that offer a big bulk of reputation. Players who play every day would stay ahead and get to unlock things faster, sure, but other players who don’t get to play every day won’t lag behind so far that they feel like they’re missing out.