I decided against fitting an additional Samsung 970 Evo M.2 1 TB ssd in my Galaxy Book Pro because it appears these devices can run at 52 degrees. In a casing that is 11.5mm thick, where will the heat go ? Nobody at Samsung has responded so I assume it could be a problem. I know the Samsung 970 and 980's have throttling but its the rest of the laptop components I'm worried about.
So for extra storage I'm buying a Samsung T7 3.2 Gen 2 1 TB external ssd.