Remember those things from world 2 and part of world 3?
How did everything work? Someone decided to go on a rampage to kill some noobs break inside their palisade and steal some shit. Ranger type players would go and search for the scents find the culprit most often than not it was some solo shit they'd break his puny palisade in return kill him and then the ranger would go place his hf in a vault. There would be a risk however someone would come and kill the ranger and that was understood and accepted. Once people finished chain killing each other and the dust settled and the einherjars expended there would be quiet for a while.
There was no safety behind walls only logged out safety so crafter alts had not much point most people had their main do crafting at least it had a chance defending itself. Unorganized shits would die once and wouldn't even have a chance to go after the ranger so when faced with months of rebuilding they either turned legit or quit win win. Organized groups would think several times before committing serious crimes because any char doing that was pretty much marked for death if the other sides wanted it enough. People wouldn't go after their enemies infrastructure for some reason though I guess it was an era of gentlemen, later though total war became more and more prevalent and I have myself to blame in part for it since I was a big advocate.
The introduction of invulnerable walls rams and the like meant combat alts become essential. The only meaningful pvp ever happened outside of towns and usually in groups. Activities related to alts like botting become much more prevalent. After all you have to feed your alt army. Groups become more and more likely to accept and "protect" shit talking shits who would have been a great security risk with the previous system but now they could be easily tolerated. In time normies quit because normies ain't got time for dealing with idiots and only the shitheads remained basking in the lack of need of normal social interactions.
Now we decry lack of pvp that nobody leaves their walls well of course nobody does it's a vicious circle.
P.S. I'm not saying going back to that just pointing out how one change lead to this....