Used to? We absolutely still do. LTO is a widely used format, and as far as I'm aware, it is "picking up more steam" each year.
https://www.theregister.com/2025/07/23/lto_2024_tape_shipmen...
Unless something is wrong with these numbers, it's simple enough to do rough math to get tape count and compare with historical numbers.
Claims of 5.7 or 5.8 million drives over the lifetime of the format can also be compared to older data to see a slowdown.
I more meant we no longer have room sized libraries unless the cloud providers have commissioned something custom and not available to the public. I believe the last installed powderhorn I’m aware of was decommissioned almost a decade ago now.
https://www.iscgroupllc.com/products/storagetek/storagetek-p...