There's absolutely no reason to use /e/ when GrapheneOS exists. https://eylenburg.github.io/android_comparison.htm
Not everything have to be perfect. For some user, /e/ is more approachable (Friendly and colorful UI) I could not get my mother to use GrapheneOS, /e/ is a lot simpler. Still miles better than to use a Default ROM from most OEM.
But what I think a lot of people are missing is what you exactly just touched on. We have options! That's a good thing. Yeah, some options are not as good as others if you wanna optimize for X. Then don't use that option! Use the option that works for you.
To me, the fact that alternatives exist on varying spectra of "degoogle-fication" is a win in my book. The fact that we're able to talk about and recommend so many alternatives is a good thing.