How would you save the raid mechanic (on your base) and make it relevant?
My take: some resource you need to "grow" in your base for a period of time, say, 10 minutes. During that time you're assaulted by people looking to steal it; if they damage it enough, you lose it.
Getting to make a base purely focused on defending what's inside it would be hella fun, and give actual use to turrets/mines/etc.