I used to be a fan of OLEDs on phones, maybe my next phone will get an OLED, but they're more technical curiosities than anything. I'm not convinced they make the overall "owning a phone" experience much better, unless you're into HDR video playback on a 5" screen. They have a lot of downsides, such as much higher cost of repair if broken, burn in and worse battery life.
Yeah some OLEDs can get a bit rainbowy at very shallow viewing angles, but you can't read the display anyway at such extreme angles so i don't even notice it. The colors look perfectly stable to me at any normal angles one might use it at (like up to 60 deg off axis).
They are great screens for phones tho. Yes they might use more power when displaying a fully white screen, but when only parts of the screen are white they use less power than LCD. This can be taken advantage of on a phone by selecting a dark theme, so most of it is black, this makes OLEDs consume way less power than a LCD while also being brighter (since it never has to protect itself by dimming). Sure sunlight readability on OLED is not great, but then again modern LCDs are also not great and need cranking of the backlight to max (The older transflective type screens did this much better). Burnin is also a lot less pronounced in modern screens, Had a OLED display phone for many years and shows zero burn in.
I don't have to look back, I have lots of CRTs in service still. There's a nice 27" Sony XBR downstairs that is used mostly for the vintage console games. I have a collection of arcade cabinets that all have the original CRT monitors, I have a 15" Sony studio monitor that will do 1080i, it looks amazing. I also have several vintage computers with CRT monitors, nothing else out there looks quite like a good CRT. Lack of a fixed grid of pixels is inherently superior IMO when displaying multiple different resolutions. OLED does look fantastic, if the made a 4:3 OLED I think that would be a good CRT replacement in some applications.
Retro gaming is indeed one good use for CRTs. The scan lines are part of the look, so is the blinking scan frequency of the display along with the instant response time of throwing video voltage directly into the electron gun.
The thing that has kept me from getting an OLED phone is that they're all huge and/or have a notch or hole punch in the screen. I can't wait for the stupid obsession with eliminating bezels dies off, I absolutely cannot stand flaws in a display. A hole punch or notch is no different to me than a large cluster of bad pixels, and I think it's funny how fanboys will get behind those but nobody would accept a device that had a big clump of defective pixels.
The notch is not a OLED exclusive thing, they figured out how to give notches to LCD screen phones too (Tho i think the hole punch camera design is OLED exclusive, but i might be wrong).
However the phones OS is aware of the very top and bottom (due to rounded corners) is a special part of the screen. By default those areas of the screen are not given to the application to use as screen space. Those areas hold the OS status bar(top) or the navigation buttons(bottom), heck if you use a dark theme that makes surrounding pixels black you can't even tell where the screen ends. So think of this as having 3 screens on the front. 1 main screen and then 2 small screens that serve to show status or reconfigurable touch buttons. The implementation really makes the difference. Just that if an application specifically asks for it the OS will still give it use of that area, so yes it is possible to watch a youtube video with rounded corners and a chunk missing where the camera is, but by default it won't, you need to actually tell it to do it (and it looks awful i agree).
The one thing i do think is a downside is that having too little of a border makes it easy to accidentally touch the screen there. But i keep my phone in a bit of a bulkier rubber case and that fixes the issue.