An Operating System is far larger and more complex than Messenger.

Somehow I wouldn't be surprised if Messenger had more LOC than an early OS...

Software today has gotten too complex and bloated in a lot of cases.

Yeah, ugh! Who needs other language support anyway, we everyone should just learn English! And pictures! In a messaging app! Everyone should learn to use and read the entire breadth of human emotion via colon and a letter. :p

> Who needs other language support anyway, we everyone should just learn English!

Why not? That's already how our global air travel system works: https://en.wikipedia.org/wiki/Aviation_English

That's not bloat. Bloat is transporting an apple with a bus (that is transporting nothing else). Modern software bloat is like then transporting that bus via an aircraft carrier, and moving that aircraft carrier by nuking the ocean in the direction into which it should fall. It's not very good.

A typical configuration was 2 to 4 MB of RAM. Just how much OS complexity can you stuff into that?