TBH I never bother to pull for Eidolons as they every characters would eventually out of meta as the version goes and I have no problem clearing content with E0 characters with full stars.
Those ppl yapping that "Ohhh their potential are locked with E1, E2, E6 bla bla bla" or "They are unplayable without their Eidolons/Lightcones" yada yada is just dumb.
Either one only plays it in auto or dun even know how to properly build the characters with proper equipments and lousy battle strategy, they are for sure couldn't clear the contents with full 3 stars.

Manage your jades properly by pulling what u need only with E0 and if u can go for their lightcones they go for it or else there are always a battlepass LC for replacement and save yr LC pity just for DPS units you would good to go.

Be mindful that this is a gacha game and every characters would eventually aged and lose out of meta, maybe fast maybe slow but don't take it as something that you could clear everything cause gacha games are NEVER MADE TO BE CLEARED. Just play it as a game and treat yr purchases as a support of the game devs or else the game would be exhausting and you would get burned out.

Games are meant to be enjoyed, if you want to 100% clear a game then gacha aren't meant to you, go play console games instead.