My hunch is that you're probably correct about the heat effects of wireless charging on battery lifespan to some degree, but I'd love to see more emperical studies on the topic. Especially comparing it to usage of wired quick charge solutions that tend to result in much higher spikes in temperature than wireless charging, but over a shorter timespan. It's not obvious to me that one would be more harmful to battery lifespan than the other.

Newer wireless chargers also usually have some form of active heat management (i.e. fans), and anecdotally my phone only ever gets lukewarm to the touch, even with a somewhat bulky case on it.

At the end of the day though, I personally wouldn't mind having to upgrade my phone slightly faster than I would otherwise in order to enjoy the convenience offered by wireless charging, but definitely speaking from a position of privilege here.