The issue here really becomes if you are trying to do more than one ETR per full TR.
You have to be mindful of the quests you run and when or you’ll make your life miserable on the second or third ETR.
Also when you’re a new player and you first hit epics, it’s a massive change. Do I think we need more level 20 quests though? No.
Personally on all my alts I do at least 5-6 ETRs because they stay in epic for a year, possibly two. My main is an epic completionist so I can't ETR which drives me crazy because I've conditioned myself over the years to 'prepare' sagas and wilderness rather than hunt xp.
What I do is skip doing quests that have an epic counterpart in heroic. So when I hit 20, I just join von or sands flagging quests and c1 and suddenly you're ready to do GH and then usually with some wilds you're 30. Sentinels and carnival give too little xp so I don't consider them important, I do them whenever there's an LFM. After the first ETR I usually IQ12-Vecna-devils-borderlands intermingled with some chrono or von or demon queen all the while keeping an eye for c2 (I hate soloing c2) and start keeping an eye out for prepping whatever wilderness I've run a lot.
Intermingle all that with people running sagas on r1, even lamordia-faildranor you can easily do with a group at level 25-26-27.
We have so many sagas in the game now and so many wilderness, that after 2-3 ETRs you can just go 20-25 just by popping sagas or prepped wilderness. However, it's not as good doing that AT 25, the best value is at 20 and decreases as you get higher.