Yev from Backblaze here -> We just started deploying more of them! We added almost 6k WDC drives in Q4 - so we're getting more of them in the fleet! They have a pretty low AFR - but haven't been deployed for too long, so they'll be interesting to follow!
We do have some drives that we use as boot drives and for logging. We write about them a bit in the post - they're primarily SSDs, so not included in the overall mix of data drives!
