I feel it maybe an administration issues. There are third-party bots allowing integration, channel/thread/role permissions which I find great but can be a hassle to set up.
A perfectly setup discord server with automation and webhooks, updates, permissions would be great. But setup of one is too complicated for the masses.
Segregating discord channels bases on roles, and staying on top of it with user influx - that would be perfect. Less than a percent (anectode) of channels can achieve simplicity like this.