Group dynamics are a poor substitute for functionality and balance.
Sometimes you have nothing else. As I wrote before, players can log out from the server at any time. This cannot be prevented.
There are also challenges that you can impose on yourself. For example that you don't make weapons and tools yourself. You can't force it with the means in the game. So you have to trust the other players.
Consider if the game had an egregious bug where, say, if you stand on a landclaim block, all the zombies get confused and can't attack anything. Now, would you want your group to agree and trust each other not to use this landclaim exploit? Maybe, maybe not. But that doesn't mean this hypothetical bug is dismissable, not worth complaining about, or not worth fixing.
But that's not the solution to the problem of preventing a player from standing on a landclaim block, you have to fix the zombie's behavior.
Some of the solutions that were proposed on the subject of "Avoiding the Horde" were very extreme. Partly you can see it in this thread.
An EMP that only paralyzes the vehicles. Not exactly a balanced solution.
Zombies that get in your way. You can live with that if they doesn't overdo it. If you have to do a slalom that only a professional racer can master then it's too much. But if you can dodge the zombies as an average player if you watch the road then you should have an interesting horde night. Maybe some players will do that in general instead of fighting the Horde in a base because they enjoy it more.
Likewise, you might have a house rule like 'no vehicles on horde night,' but that doesn't mean there isn't an imbalance. As always, the 'if you don't like it don't do it' attitude doesn't allow for trying to make the game better.
Better is a very subjective term.
Is a 3m high zombie that destroys walls with a single blow an improvement of the game ? Some players think yes, others think no.
Is it an improvement of the game if food spoils ? Some players think so, the developers obviously don't.
Is it an improvement of the game if you prevent players from using vehicles during the horde night ? Some obviously think yes but I think it's no improvement.
Making sure the player has to watch the road and not just push W and drive away from the zombies is certainly something that makes the Horde Night more interesting.