But GrapheneOS doesn't exist. It works only on a few devices created by Google, so their claim of being degoogled is a bit funny.

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.

As someone who switched from FP4 with /e/OS to GrapheneOS - absolutely not true.

My reason for switching was a bug where the phone calls didn't display the caller number. So I switched to GOS in hope it would be better... and it is, but not in all areas. For example their insistence on not supporting MicroG leads to poor UX, because let's face it, you can't trust Google services, even sandboxed, to not syphon tons of data into the cloud. MicroG was easybto use for privacy. They also seem to be very opinionated about (not) using a firewall for privacy, like NetGuard, instead recommending some weird alternatives like DNS firewalls. And don't get me started on their icons - I don't mind ugly-ish icons, but they are taking the ugliness to a whole new level.

GrapheneOS is not a bad OS, but it is very opinionated, and they (heavily) prioritize security over privacy. When I turn FP4 on, I still like it way better than GOS. Still, I like seeing who is calling, so I'm not going back... Ymmv.

Even on non-pixel devices, unless you really want to use the /e/ "ecosystem, there are probably better options like LineageOS for microG iodéOS.

(/e/ used to be heavily based on an outdated version of LineageOS for microG. I'm not sure what the current state is after I settled on second-hand pixel with graphene)

There is when you have a phone that isn't a pixel.

There absolutely is when your concern is not only moving away from Google but also using sustainable hardware like Fairphone, which GrapheneOS doesn't support afaik.

Unless you own some obscure phone that is not supported by GOS, Calyx or Iode, but is by /e/... Not sure how many of those exist...

is "/e/ supports my phone while graphene only supports google pixels" not a good reason?

And even if GOS doesn't support your device (due to minimum security requirements) why not use upstream LineageOS?