Only sunglasses can be a problem

Still also not how this works.

The phone will lower the wattage that it’s allowing „inside“ the battery. Either the charger does it or the phone will not charge anymore

So phone charges at 18w in the beginning wants to drop it down to 9w when almost full (80%). The charger either says „sure I can do that“ and provides the 9w or the charger doesn’t answer and the phone stops charging.

MFI is basically a seal of approval that it will 100% work as intended

You’re probably right. Don’t know which iOS 16 version It is but the iPhone now stops charging when it gets too hot so maybe check your battery stats to see if that was the case

That’s not how this works. The phone tells the charger when to stop charging not the cable

I would get a 13 pro or pro max instead of the 14 plus it’s basically a Better phone

It’s a 6 year old phone so no it won’t be as smooth as it was when new