Well, we have similar iPhones and usage, except I mainly listen to podcasts when doing mindless tasks around the house and when I am out and about. . . I prefer to use a keyboard for texting/email and pretty much everything else that requires typing, so I limit my use of the iPhone except when I am away from my Mac.
I am leaning toward upgrading to iOS 15. I expect that in 2022 I’ll be getting the SE 3 to replace the 6S, unless I get a little crazier in the meantime. Thanks for your help.