Although you have to code it into your app, it is possible to greatly speed up the transition by implementing the full-screen delegate animation methods and just refusing to use the given transition time value (i.e. make it shorter). Then, at least your app snaps right into Full Screen.

BetterTouchTool lets you program keyboard commands to do stuff like this.

Though you are correct that it would be nice if this was built into the OS.

BetterTouchTool is great but it's a commercial add on you have to pay for.

This illustrates to me that Apple just doesn't get it.

My guess is they probably spent more time on the Split View animations knowing they could show it off in a keynote than they did considering how people who actually like keyboards as tool would use it.

It's 2018 and they still don't have a keyboard short cut to open the context menu so that you can get spelling suggestions without using the mouse.

All their guff about accessibility is just that, guff.

I’ll throw in my favourite as well : Shiftit is the first extension I install on any new Mac I set up.

Hammerspoon can fix both these issues, really cannot recommend more.