GrapheneOS says Google is making life harder for rival operating systems and devices
(www.androidauthority.com)
I get that. And I did not want to generalise so much but I guess I did.
I do think its the minority of Grapheme users that are culty to be fair. And the main GOS dev from what I've seen online.
In terms of smoothness, my wife is very non techy and immediately gets frustrated when tech doesn't work. She (and I) uses a Fairphone 6 with e/os and the experience is very smooth.