Eh, ok. So prior to 2.6.x we had maybe one desync every two or three complete multihour games. After 2.6.x as soon as you get desynced u got two choices: 1) drop to menu, rehost the last autosave, wait 3 min for people to download the save and hope desync would hit you 2) save after desync, rehost that save, wait 3 min for people to download the save and get desynced in hour, repeat, desync in 30min, repeat, desync in 15min, 200 years into the game? tought luck, desync every ingame month, literally. My group is not some rare case, plenty people complain on discord and reddit about it. Theres something really wrong with game since 2.6.x and if you have save that desynced once, something is broken and will literally keep desyncing you more and more often into the game. if u know the 'trick' to dont save after desync and roll with autosaves, still you will get desyncs in late game but every 30-60min lets say. Before 2.6.x we literally had maybe one late game desync in last 30hours of playtime, now we get desync every hour, so you were right, humans are prone to error, it may be 30x worse since 2.6.x.
All of group members have same hardware, software, isp (1gb fiber), no problems with connection in other games that we play, it literally changed with patch thats it, no other variables changed, we dont use mods either.
We even had 2 situations when we desynced during save loading when we rehosted the game, we also obv tried different hosts etc.