Personally, I use all those regularly.
Chords can remain easily learnable down to about 65 keys, but on a smaller layout (~40 keys), you have to memorize multiple layers for dozens of keys.
This guy gets it.
I suppose if I bit the bullet and unlearned years of muscle memory I could do without those keys, but at this point it's not worth the effort. I'll stick to ThinkPads if I need to code on a laptop.
Personally, I use all those regularly.