It has to be in the game. It’s very important feature for ranked multiplayer games, i haven’t seen any competitive game that has no reconnect feature.
Show me a game where you can be afk for 5 mins → reconnect and not be super far behind.
You have not looked very many places then.
See basically every single RTS.
I think they should add it for custom games though.
3 Likes
It’s obviously goes in pair with pause.
But I still remember a meme in aoe2, when MBL went to park his car, return and won the game.
PS in 4vs4, i had to go afk for 10 minutes, returned and we won the game.
Sorry can not show exact games, cause only 10 replays available. 
(may be it was unbalanced teams… but so what…)