Ok pa rin ang performance ng SE 2020. Unless you're gaming, I don't think you'll stress the A13 Bionic chipset.
I haven't explored iOS 17. At first glance, it feels the same as iOS 16. If I didn't go to Settings - General - About, ni hindi ko mapapansin na upgraded na.
I probably will try the new Safari profiles feature though (for personal and work). I think it mostly offers refinements rather than any drastic changes.