Top only guides are fantastic tbh. Chain retention is pretty much 100% with one of those and a narrow/wide ring. (you can still backpedal it off, or have it fall off in a crash etc but I’ve literally never had a single chain drop since I started using them,including dh and enduro racing, the mega, etc etc) The narrow wide does all of the heavy lifting but the guide is what makes it perfect.
And they weigh almost nothing, are cheap, and very very easy to fit so there’s almost no downside. IMO if you’ve got ISCG mounts and 1x you should probably fit one, whereas bash plates are definitely a thing that most people don’t need.
Single ring makes bending chainring teeth pretty hard since they’re protected by the chain. Course, you can scrape and damage a chain enough to cause problems but I’ve never had it happen. Stopped using bash protection except on the dh bike when I went 1x, since back then I might bash the ring while in the granny.