I've changed my mind; shared doors aren't awesome, they broke the game.
Let me try and explain. At first I thought, man it's tedious with 5-6 people in my group to build a base where we can all access the loot room. Wouldn't it be amazing if we could all use one door?
It is amazing. It's incredible. It's awesome.
It's broken.
One of the key problems with rust is huge groups. I'm not talking 4-5 people, these groups are OK. But you've seen them, I've been apart of them on servers, those groups of 15 people with no life that in 3 days destroy your 200/200 server and make everyone leave. One of the biggest detractors from huge groups originally was base design, and how to share loot. Now me and all 9 of my friends all use the same doors and build a base that is practically unraidable. The rate at which 10 people can make metal doors and build upwards greatly surpasses the rate at which 10 people can farm and make C4. A base becomes practically unraidable in a matter of a day.
I was recently playing on a server with 5 or 6 such groups, after a few days, that were entirely untouchable even by each other group. So the groups just constantly raided little people, and the server is just littered with empty houses, after just a few days. Back in early steam rust days, my group of 5 people all had to build our own doors to the loot room, which led to complicated housing designs, which eventually led to seperate houses... With all seperate houses and seperate loot, we were individually raidable. That was a more fun time for the game than the mega-bases we see now that are unraidable after a few days.
With doorshare / combolocks and without the ability to travel quickly via vehicles outside the playable area, a server won't last more than ~5 days and continue to have a healthy growth rate. It's why so few servers are near cap anymore.
The problem is not in the game design but in the mentality of all the players that want to play solo. People have to start to play smart instead of playing selfish.