I think if other Beast Tribe quests used this feature, it would be really helpful for players who didn't get the chance to do them in 2.x, or new players who missed them since Heavensward came out.
I think it would also provide another way for people who haven't done them to level up 50 to 60 (since I've been doing the Gundu quests to help level my Astro).
What does everyone else think?
Probably. I mean, if you want to use your lower level classes, I'd recommend using them regardless of your max level classes.
I know it'd just be a pain to me. Avoiding the mobs in Outer La'Nosca is a pain in the ass. I suspect it'd make the Sylph "Carry this object before the time runs out" missions a little anti-climactic.
For the Ixali it wouldn't work since there are both combat and crafting steps in the same quest meaning you need to use two classes to complete the quest meaning it won't work. For the others though, I guess it could be a good idea.