

Indeed. I think that you have to remember that the vast majority of BitLocker users would go from no encryption to encryption with your key in the Cloud. Given the he risk of complete data loss this is imo a decent risk/reward in most cases. You need both the physical computer and the MS account login, and the US government also has the latter.
If you want to make an active and informed decision there is of course much better option s, but know that you would be responsible to keep the unlock key safe or risk total data loss.




OP mentioned having ADP and automatic backups enabled and I believe iCloud sync uploads photos continuously. The biggest risk is as you say battery saving and if it will upload data over mobile data (should be a setting for that).
Further than that I would say the big question is if someone else would actually be able to access the data if OP is detained… and of course https://xkcd.com/538/ (I don’t think the random chuds in ICE would have the know how for any technical bypass)