What are the advantages of SATA DOMs?

What makes SATA DOM so great? They have a nice compact form factor, but they seem like low capacity but really really really expensive storage with a SATA interface. Do they have crazy high endurance or something like that?

I think it’s just geared towards servers where you need a boot device, but there may not be any available slots (or controllers) for a storage drive. definitely more durable than a USB flash drive.

newer servers are more likely to use m.2 as their boot drives.

Space saving boot device in the pre m.2 format years.