I've been contemplating buying Synology specifically for SHA-1 + BTRFS to accomplish the 3 bullets below. I was hoping HexOS would support something similar:
Ability to add different size drives in the future
Use 100% of the new drive - e.x.: have 2x10tb & 2x18tb then buy & add a 20tb, using 100% of all the drives.
Bit Rot protection