This is missing one of the finer points of redundancy: With 4 disks, losing two of them could take out a RAID-10 (both halves of a stripe component), but losing two cannot take out a RAID-6.
The fact that btrfs isn't stable after 15+ years for parity setups is, IMO, unreasonable.
It is my guess that everyone in the thread with "Hey, I don't type normally either and my speed is just fine" comments are likely staring at the keyboard when they type. All two-finger typists I've personally witnessed, even the extremely prolific Roger Ebert, couldn't effectively transcribe a printed document with their learned typing style.
If you never have to type something you're reading, I'm sure unique typing styles are just fine.
I co-founded MobyGames with one of my oldest friends. About a decade later, it weighed very heavily in my favor getting a DevOps position at a quant trading firm, as they were looking for people with initiative, unconventional thinking and troubleshooting skills, and a willingness to solve problems.
The fact that btrfs isn't stable after 15+ years for parity setups is, IMO, unreasonable.