But the site has a responsive layout clearly designed to look nice on mobile screens (with hamburger menu and everything :), so, at least on some level, they are caring about mobile.

BTW, the website looks really nice. Kudos!

Also looks nice on Emacs' built-in web wowser (M-x eww)

I run Emacs under termux on my Nexus 6P. Works great with exactly the same config I use on the desktop.

What keyboard do you use? Key combos are soooo slow on a touchscreen keyboard.

An old HP Touchpad Bluetooth keyboard. It works fine though not having a meta key on the left is a bit of a pain.

I have a Logitech k480 for my TV and Nexus 9. Works nicely with termux, Emacs and similar software.

Yeah, if you can't handle a meg of downloads, are you sure you can handle the hundreds of megs of memory? :)

1980s :)

EMACS is from the 1970s, GNU Emacs 1980s...