Partiko seems to be on auto pilot and luckily works well most of the time. but no one knows what its future may be.

Steem Engine just sends some custom json to the blockchain which is easy to do with any library like steem-js which I use. I haven't tried their site on my phone so I can't say how it works. What would be an example of a good phone wallet? I have Lynx Wallet on my phone and it looks and works good.

And Steem on Scatter - its late and getting brain dead, so what is the benefit there? We do have keychain which is like scatter but for Steem, and its a browser plug in rather than something like scatter which, at least on my computer, runs as a desktop program. And I think there is a mobile scatter but I think it failed me when I tried to run EOS Knights on my phone. I think scatter isn't developing the mobile version as quickly as the desktop version, but not sure.

I'm good at reading typos, and make them often myself! :P