If Macs and iPads are able to bypass the battery entirely and power the hardware directly through the charger, then it shouldn't have an effect on the battery.

If Macs and iPads are able to bypass the battery entirely and power the hardware directly through the charger, then it shouldn't have an effect on the battery. But it's also possible that it's just charging the battery while also using which will shorten the battery life, especially as you don't allow it to do full power cycles.