firstly, They DIDN'T remove them. The default limit was changed to like a million bytes or something. Basically no limit. You can still set a limit just fine with core. Even when 30 comes out.

secondly, if and when they DO remove OP_RETUN limit it's just the OP_Return limit. All other policies remain. policies generally exist to make sure the user doesn't fuck something up and make a bad tx. It's not for making sure the network doesn't get the transactions.

I actually don't run core or knots, but I do run a node. I'll let you guess the flavor. It's one that doesn't have any policy restrictions for anything. I can make whatever transaction I want to with my node.