no
Watt is like how fast your car can drive, but the speed limit is how fast your car do drive
the iphone draw as much current as it was build to use when charging, the fact that a charger can provide a lot more just means it's not having its full capacitive used
so as long as it's no higher than 5volts and the connector fits and it's minimum 5 watt then it could be 5GigaWatt without problems
from the day a recharable battery is created it begins to die, you can only slow it down, sooner or later it will have to be replaced
have you read
About the battery and performance of iPhone 11 and later - Apple
Support
and maybe
iPhone Battery and Performance - Apple Support
and Batteries - Maximizing Performance - Apple
people report
apple does not change the batteries until they are lower than 80% in health