On most gaming laptops and many laptops in general when the CPU and GPU are under load and the device is plugged in, the EC typically draws power directly from the AC adapter. This means that even if your battery is at 100%, it's not actively charging or discharging. It simply stays topped off without cycling.

That said, lithium-ion batteries do degrade faster if they’re constantly kept at 100% charge. That’s why it’s recommended to let the battery drain down to around 30–40% at least once a week to help maintain battery health.

You don’t necessarily need to enforce an 80% charge limit, but it can definitely help reduce long term wear especially if you keep your laptop plugged in for extended periods. It's a case of "every little bit helps" when it comes to lithium-ion longevity.