This is a very good tip. You have to build houses anyway; try to use them to "wall off" an area instead of just randomly placing them anywhere. Especially with civs that have small houses, you can surround your entire field economy by lategame without any real additional investment. As ffm mentioned, to not have unnecessary long walking times, you should include palisade gates at regular intervals when doing this.

Atm. for me it depends. Ideally, long time ago when I could out-boom other players it's not necessary and slows you down (hence turtling). I prefer amoebae-style reach for extra res. or be near the front player. That again makes my base a bit weaker. House walls in combination with surrounding hills and just some gates are a good compromise. Especially if you expect another player to come with lots of cavs or siege maps (Corinthian isthmus, ambush) I get infuriated when I see teammates building huge stone walls, indicating they have no intention in joining a fight anytime soon (except they communicate before, "I turtle you can help on the other side") Another huge priority is that workers should not walk across your base a lot. So if you think on that side could fit some wall/building use only a few workers and preferably ones from nearby or maybe don't at all. That also goes for amoebae-stretch for res, it could be bad to stretch for some berries if you're exposed there and don't have any other business there.

@Gurken Khan it can be fixed by giving them a "selection group name". I'll make an issue.

Well, it's not what I expected, and I don't think I've had it before. And frankly I don't like it.

Not specific to a27.1. Not really a bug neither. A variant of the marine seems to have been created in order to make it unlocked by default in PII in the gymnasium.  https://gitea.wildfiregames.com/0ad/0ad/commit/ba635f2790762fbf74541013a6247619519c0ebc

My marines are not bunched together. I think one batch is from the Gymnasion and the other from a dock, still... (Ctrl group 4, should anyone bother with the save.) savegame-1900.0adsave