Adrian Kingsley-Hughes, on ZDNet:
The issue is that when the iPhone is being charged using a cable, the phone is being powered by the cord (there is some load on the battery, but it’s minimal), but when using wireless charging, the battery is what’s powering the iPhone, with the wireless charger only being used to top up the battery. This means that by switching from a cable to a wireless charger, my battery isn’t getting a break, and in turn, this is making me go through recharge cycles at an even faster rate.
This is an interesting fact, but I’m pretty sure the impact is minimal, especially considering that most of the new iPhone X users use their phones more often now, because of all the new stuff, which could account for the increased battery cycles. I know I use mine more often — I was so bored with the iPhone 6-7 form factor than I just reached for my iPad whenever possible.
The truth is that wireless charging is more convenient at times and I just don’t want to sacrifice that for a few more charge cycles. A replacement battery is cheap enough, that I’ll just get that when I need to.