I'm a photo/video enthusiast, and I ran a photography business for a few years before selling it. I think that there's little reason for most people to get cameras these days.
One of those reasons is that you need to spend a fair bit on a camera for it to be noticeably better, as well as even more cash on good lenses. You'll want fast primes to really see the differences, and they're not cheap, especially fast, wide primes.
After that, you need to learn some photography (basics of course, but ideally also composition etc.) and you'll need to learn to edit RAW files if you want to get the most from your purchase(s)... so Lightroom, Photoshop, Affinity or something along those lines.
You'll also need a gimbal if you want video to look as smooth as the iPhone, and a tripod if you want good night shots, amongst many other things. Even with a mirrorless setup, that 7 kg carry-on weight limit in many places around the world will be your enemy on every trip lol.
Basically, getting a real camera/lenses is for the hobbyist or professional photographer IMO.