Very interesting post. Which version of simple launcher did yoy find?
I also use brave (on note2) is really cool. Im considering trying Opera.
For mail, I use brave also, work ok and is one less app to use ram.
Also Fdroid and Gplay. Always first try fdroid.
For file transfer, Zarchiver (That also supports zip files)
Plus: i have catalogued my books with
this app, is very lightweight, offline and simple