What is W11?
Since you're asking on the AppleTV sub, you can go into the AppleTV System Settings > Accessibility > Subtitles and Captioning > Style and you can change the font, font size, and font color.
Source: https://support.apple.com/guide/tvapp/activate-subtitles-and-captioning-atvb5ca42eb9/web
Honestly for what I use my phone for... I'm good right now. I don't need anything else nor do I feel like anything is missing. I take some photos, read some stuff online, text and have phone calls.
One bug I keep running into though is that iMessage keeps sharing my status as being in "Do Not Disturb" mode after I end sleep mode in the morning. I can toggle it on/off but people send me screenshots showing they see me as still being in DnD mode. All I can to is turn off my status sharing, which feels like the wrong way to fix this. This happened to me in iOS 16 and I had hope 17 would fix it... nope.
So far my favorite iOS 17 feature is that I can select an album for it to choose a randomized lock screen wallpaper from.
True, but I feel like back then an app with ads just had a banner at the bottom or something. Now "ads" means a full screen unskippable video every few minutes. No thanks.