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that arrow keys are some newfangled idea that might not have reached your terminal manufacturer yet, is massively out of date.
Even if one does not teach the arrow keys first, the BS SPC SO (Control+N) DLE (Control+P) set is surely worth teaching early on. One cannot make any reasonable argument that terminals might not have spacebars. (-:
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.
Insisting so much on hjkl is silly. No one is using an ADM-3A in 2026, so the official documentation should let users use the more intuitive cursor keys and downgrade hjkl to what they have always been since vi: __ham-fisted alternatives to the cursor keys__.