on 2015 there isn't any problems except as all NVMe drives: higher speeds means higher battery usage.
I rather think that the GenericNVMeDriver kext in macOS somehow doesn't support APST for Third party NVMe drives, which allows lower power state at idle. (ex: my 970 PRO consumes 1.5W idle without APST, but consumes 30mW with it on according to Anandtech bench database)