Ya, while number checking provides an important 2nd eye, it's not invasive to the adventure like a full judge would be. The only drawback I see is the lack of a immediately responsible backup in case of the primary DM being unable to finish the adventure. I think Mowgli has the adventure up and shared, so although it would not be as seamless, it can be picked up by a backup should something unforseeable come up.
As I recall, I'm still up as a full judge for SS21's adventure, pending start. (Children of the Mud)
PS: Mowgli, this being said, I can be judge for you. Very recently I relieved one minor thing that was eating up some spare time, so I can reasonably handle it now. I hadn't thought about it from that angle until now.