Questions about Switching to OP13

Hey everyone, I've been using an S20FE for the past 3 years and is planning to upgrade this year. I was torn between Samsung, Pixel and OnePlus. After seeing the new OneUI 7 situation and the S25 series, Samsung is probably out of the equation (I was wishing for a bigger battery, faster charging and an improved 3x lens but was disappointed). I'll still wait for the Pixel 10 to release but from the leaks so far it isn't shaping up to be a good deal either (also really expensive in India and not many launch offers). So I might end up buying a Oneplus 13.

If you guys could answer a few questions it would be so helpful

  1. How's the telephoto camera performance? I've heard a few negative opinions and am a bit worried coz I legit find it more useful than even the main lens

  2. How's portrait mode, especially the subject separation and handling of skin tones

  3. I've been hearing about notification delays on Oxygen OS in the past, someone confirm if they're fixed. I don't mind slightly delayed Gmail notifications that happens in all Android phones, more so worried about missing crucial notifications (calls, WhatsApp and such)

  4. Does it support 3rd party icon packs and if yes, is there an option to switch icons for each app individually in case there are a few icons missing in the selected pack

  5. Any other thing to know about when switching?