I am currently using a rooted LOS with MicroG. It certainly is not as secure as GrapheneOS in terms of app sandboxing, encryption, regular security updates, etc., but I have control of the system, in case I need it, for instance ACC, F-droid privilege extension (F-Droid auto updates), ReVanced Manager (not using it currently) etc.
I trust GrapheneOS much more than Apple, but both go into a similar direction with their understanding of security. IMO taking control away from the user might be a good option, if you are dealing with just regular consumers, but I don't really like the "one-size-fits-all" approach of it. And it is my device, I should be allowed to decide what I want to do with it.
BTW, this is just a personal annoyance of mine. The GrapheneOS devs do a very good job.