I can vouch for the BrewBag. Though I don’t have an all-in-one system, I’ve been using a BrewBag in my mash tun with false bottom for many many years.
It’s a ‘belt and suspenders’ approach with the key feature being easy cleanup. Pull the bag, feed the deer, rinse it and the mash tun, and it’s done.
I’ve used it in my outside gravity system, moved brewing inside with RIMS, and now HERMS. I don’t brew without it.