Is E6 a gamechanger?

I’m stuck on E5 after getting E20 Yukong and losing 50/50 to Yanqing.

I’m initially did want to get Fugue, but told myself if I lose guarantee I have a higher priority for 3.0 units and will get Fugue on rerun.

That said I really was hoping to get 2 copies of Gallagher to finally E6 him but he managed to evaded my 80 pulls and now he’s stuck on E5.

I don’t see any announcements about 4* selection including Gallagher anytime soon so I’m really torn if I should risk few more pulls to E6 him or just let it go.