Even the 100MB/sec won’t work for long as these stupidly small MicroSDs tend to heat up A LOT and then go into throttling where the transfer rate goes down to <1MB/sec.
I'd say it's perfect for security cams or any cams using compression. You could store 14 days of 5120x3200, 60 fps, H.256 HEVC video. Or ~1 day of that at 850 fps.
even just for my phone it's not like i'm constantly transferring data to storage, i don't care if it takes a couple seconds to save a video, what i care about is being able to save 5 billion videos
For a brief moment in my life I worked as data manager in a movie set, and remember studying for that job and having to talk with the DP and the cameraman about memory cards, recorders and checking with them that the quality output of the camera were not bigger that the speed capacity of the memory cards. It was fun times, and sometimes I wonder how my life would be now if I never left Argentina and had accepted the next gig the movie producer called me for.