Yes, hjkl navigation is certainly one of the things that should learn about a vi clone. But are novices well served, in the 2020s, by that being the primary thing that they learn before anything else? This is not a criticism of this WWW site specifically. The VIM doco has the same priorities, teaching hjkl navigation before arrow keys. (So do nvi2 and NeoVIM.) The problem is that the received wisdom, that arrow keys…
The reasons I still use vi-style editing in editors are: 1. Efficiency, so I can be fast 2. Minimal stretching and whole-hand movement, so I don't get painful wrists and so I can be accurate. Using a keyboard's arrow keys doesn't fit with 2.
That does not really present any argument that we should be teaching your way of working to VIM novices, instead of teaching them the obvious arrow keys first and the hjkl navigation later.