I have no doubt that Android would run a package, I have no doubt people can use a BT keyboard and mouse, but unless you have a 20"+ android tablet, apart from the fact it becomes unportable at that size, why would you want to? I have a laptop from 10 years ago and it runs all of the apps I want, it's a 17" screen, I can hook up a 3 button mouse if I am feeling adventurous. I would in no way want to try and produce a professional or hobbyist circuit / pcb design on my samsung phone though! Ludicrous! So yes, comedy gold!
With regards to KiCAD, I have built several from CERN and they did take a lot of faffing around to get it to go, but did manage it.
It's a difficult one, it's quite mature and very well built for it's price! (Free) but I would not want to use it for anything commercial, although more than capable, I am not 100% convinced it is stable.
I am really not sure what the hate is with Autorouters, place critical clock signals or high speed ones by hand sure, but for the rest, eh, auto route away! They do not always produce the "prettiest" results, but 99% of the time they do an very good job (depends on the autorouter, granted) at routing, I have found that ripping up and changing component layout can yield better results, as long as you set the auto router parameters it will work, I have been surprised in the past on autorouter boards as they have looked aesthetically pleasing and when asked how the answer has always been component placement and setting the auto router up. Personal preference I suppose.