Manjaro is....tricky.

I've called it an Arch based distro that kinda sucks at being an Arch based distro before, and I stand by that. You can't treat Manjaro like you would EndeavourOS or Vanilla Arch Linux because of how Manjaro decides to do things: essentially, updates are held back by a couple of weeks for better and worse instead of being released as they're made avaliable. While that means it can catch disastrous things like the GRUB issue another user pointed out (Manjaro was unaffected by it IIRC), it also means the system is prone to breaking itself more often. You can forget about using the AUR if you're using Manjaro–or well, you can, but the AUR and Manjaro are nortorious for not playing nice with one another because of the latter's tendencies to hold back packages.

Personally, I wouldn't recomended. I had more trouble with Pop_Os!, yeah (even tho i can admit that's my favorite spin of Gnome 3), but Manjaro just tested my patience more than anything else. However, If you don’t mind being extra careful with what you install (really that’s standard practice for any distro, but hey, I’ve never found a WIP package that messed up my system anywhere other than when using Manjaro, so make of that what you will), are willing to tolerate constant mild to severe breakage, and just using Flatpaks and appimages over the AUR, then give Manjaro a try.

I wouldn't go as far as calling Arch the antithesis of easy (tho you are right that it's like a toddler you have to constantly babysit. Don't like that part, but I wanna say that's most rolling releases, no? Plus I haven't found a stable release that i jive with either, so nothing left but to tolerate it), but then again, that varies from person to person. After all, I struggled much more with Pop_Os! (in general) and Fedora (more growing pains than anything) than I ever did with Arch, and I'm an idiot when it comes to computers--pretty good at looking up answers to problems tho lol

Issues are pretty mixed IMO. There are ones beyond our control like the GRUB one and the backlight one, can't really do much about them (but I'm not gonna pretend it's only an Arch thing. Every distro messes up once in a while) except sit tight until there's a fix...or well, you could try and fix it yourself, but then we lead to the other thing, in my expierence, anyways: 90% of issues happen because the user messed with something. Not even something obvious, i mean mucking about within the systems guts for one reason or another without knowing what you're doing. I've since adopted a golden rule: you don't bother the PC, it doesn't bother you. Personally, haven't had problems besides the backlight one, and even that was fixed quickly.

Regarding Tumbleweed and Fedora, they're good options, but installing nvidea drivers isn't super straightforward. Would have still recommended Fedora, or even better, Mint if they hadn't said they were looking for a Rolling Release, actually. Nobora should be easier, or so I've heard. Never actually tried it myself.