"New game plus - quests will have no rewards..."

[Verlyn]

It is only a more recent convention that you should do daily roulettes along with MSQ to stay ahead of the cap.

Thiiis is not true. There is a point, usually multiple, in every MSQ where you hit a level wall before the next quest and the only way to scale it was either FATE grinding or a hearty amount of extra dungeoneering. It's easy to forget now that general exp from 1-60 is faster, but it happened when they were relevant (and still does in Shadowbringers quests--the stretch from 78-79-80 needs some dungeons).

ARR especially had it bad around the level 40s.