I played 2 some time ago but there are many things from that game that I don't remember. I do, however, remember the difference between the research systems in both games. It's simpler in 4, I believe.
My name's emptypromises (i don't know why i'm writing that since anyone can see my username but anyway).
Autistic.
TCC.
HOI4 player.
Been a fan of the site for about a year.
Maybe you'll see me on High Score/Loserinfo someday.