In my opinion, the most important laptop spec is its cooling power in watts. Laptop vendors do not provide this information because laptop users do not understand how important cooling is. Lenovo ThinkPad P15 Gen 2 is good example of this problem. It has very powerful CPU and GPU, but…
The cooling system is chunky with dual fans and a plethora of heat pipes, but the laptop still runs hot and throttles up to 20% under full load. Those two fans are also quite loud when spun up, hitting between 50 and 60 decibels at full tilt. source: Lenovo ThinkPad P15 (Gen 2) review: Outdated looks hide high-end workstation performance and features | Windows Central
Thermal design power (TDP)… is the maximum amount of heat generated by a computer chip or component (…CPU or GPU…) that the cooling system in a computer is designed to dissipate under any workload. source: Thermal design power - Wikipedia
Correct me if I am wrong, but I believe that buying powerful laptop is a waste of money. You can reduce its fan noise by forcing its CPU and GPU to run slowly (throttle), but it seems more rational to buy slow, cheap laptop instead.