Incidentally, at age 26, I used the “left-handed” Dvorak layout for 2 weeks while my right wrist and hand healed from a dirtbike crash. I was only becoming proficient at the 2 week mark.
The Dvorak left- and right-hand layouts are not as widely known, and look nothing like the standard two-hand layout… but are incredibly optimized. Even the number row is remapped to accommodate letters. Once I started to grok its efficiency, it felt like 10-key’ing entire words at a time. Might be interesting on modern phones.
I experience the same thing with QWERTY and tendons in wrist & forearm. I have to slow down - a lot - and take breaks. I just remap teh kbd if > 15 minutes. iOS kbd keeps my brain familiar with QWERTY; no first-party Dvorak and I don’t expect Apple to ever include one.
On the less-bright side, lack of other layouts on the PinePhone have made using it a bit torturous for anything extensive, and that makes me enjoy using mine for anything a bit less.
I'm letting my daughter learn it when she's 8 instead.. they just.. learn it. It is truly fascinating from the perspective of a typist.
So maybe the youtuber is onto something. I think that you should have a clear strategy when learning though, that will probably speed up the process alot.