Android app looks sort of worse than just mobile site. I.e. webapp added through Google "Add To Home Screen" looks better than native app. Plus native app does not support multiple servers. While web app is fine with this (I can add two mattermost "app" with ease) In the same time. And the only feature I'm lacking is push notifications.

Please do this! As a hobbyist user, the only alternative for push short of buying my own Apple and Google developer IDs is to buy a user on a hosted instance (the website is not really clear on this so I initially thought you could purchase access to the Mattermost hosted push server) and Mattermost.com does not sell single seats, the minimum amount is 10.