I personally like the convenience of starting with a full battery and using my device freely, so I'll just have the battery replaced as needed.

I'm not sure, but I get the feeling my iPhone cellular/Wi-Fi reception is a little weaker in low power mode.

I like the convenience of wireless charging, but the phone gets quite warm/hot.

https://chargie.org/ helps by charging the phone slowly (less heat) and limiting the maximum charge.