So I decided to play warcraft on pre-reforged patches for built-in widescreen support and stuff, encountered shitton of bugs in sp campaign: npcs doing crazy shit, dropping items in cutscenes, heroes can't equip items. I googled for solution and found this:
https://us.forums.blizzard.com/en/warcraft3/t/bugs-in-warcraft-3-since-1-31-update/6906
It turned out that wc3 singleplayer was already dead before reforged even arrived, what a joke. So now if I wanted to replay SP campaigns I either had to go back to good ol' 1.26/1.27 versions with screen tearing and 4:3 aspect ratio, or find an elusive patch 1.29.2 which is considered less bugged (at least for campaigns) and works nice on big screens. I had to find an archived copy of torrent file on a russian torrent tracker to find it and for now it works okay, no major bugs encountered.
Modern blizzard is such a fucking embarrassment, and I remember Blizzard being basically a quality mark of videogame world