Makes sense. I've only own the 5W from the SE so cannot check the thermal increase with a 20W that I was considering buying. Usual habit is overnight charging but for an upcoming holiday am looking at options.There will definitely be more heat with a 20w charger, just touch the phone during charging you will see yourself. Using fast chargers excessively will obviously degrade the battery a bit faster, thats just the law of thermodynamics we cant escape it. A good balance is using a 2.1 amp charger, not that much heat and charges faster than a 5w, or use 5w overnight. The most important thing to remember though is we can change the battery for around $£50, so nothing to stress over really.
On that note, got a thread on the Apple Battery Pack concurrently running if people have thoughts on it. Also for the holiday.
Yes, made the decision not to have AC+, instead, new battery transplant in 2yrs (or when needed). Not waiting 5 yrs this time as I did with the SE.