Step 4 is only necessary if the client didn't pay through the order form, and instead sent you a manual payment. The only steps you really need to be aware of as an admin is #2, 3, and 5. That process is necessary when you require manual review of all orders.
I think it makes sense that if you "require manual review of all orders" that you manually review the order before you activate the service. This has been brought up before, but it seems as though you're getting ahead of yourself, or forgetting that the orders require manual review. In any case, CORE-1370 will be added to deny service activation before manual review, and to remind you of that fact. That will, at least, resolve the current issues that arise from activating a service with the module before manual review, where modules return errors and fail to add the service.
#1 is planned in CORE-1229.
#3 will be resolved in CORE-1370 as mentioned above