As one who is a source of camera bump 'hate', I will just point out that there was a time where the camera for the iPhone 5 was the big thing. And guess what Apple did with the camera for the iPhone 5? They made it flush with the casing. No bump.
I resisted buying the iPhone after the 5 until around early 2015. I still hate the camera bump and it's only gotten fuglier over the years. But I like iOS more than I hate the bump. Someone else also pointed out that, given the specs of the camera, it's not feasible at this time to make the camera flush. The technology is not there yet. Which I understand. Still doesn't make me like the camera bump.
I don't use cases and I'm not a pro photographer, or even someone who is remotely interested in taking pictures. A vast majority of my photos are of retail products on store shelves that are sent to my wife so she can choose what she wants me to get her. Most of the rest are screencaps.
If I'm going to do photos, I put down the phone and get a camera. So camera specs (and thus the justification for the camera bump) I don't care about.
You have a theory about furniture. Well, I have a theory about what all the people who are cool with the camera bump are going to think/say when Apple finally makes an iPhone that has the camera flush with the housing (again). And that is…nothing. That's right.
The moment Apple can make the camera bump flush again, no one who loved the camera bump is going to say a word about it. Why? Because the camera bump love is superficial. Those who love the bump justify it because it's not technically possible to make it flush right now. They love the camera specs more than the bump bothers them. But if you can improve the camera and make it flush with the housing, then there's no reason to justify that anymore. And so, the variety of reasons offered as to why those who do not love the camera bump should just accept the camera bump become moot.
None of those reasons are going to hold any water when Apple finally makes the camera bump flush with the housing. There will be absolute silence from them. One day this will happen.
Now, if you want to talk notch hate and dynamic island hate, those I don't understand - just like you don't understand camera bump hate.