I think you are right that this is overdoing it on the safety front. But only just. Ugh. it feels so wasteful. Plus, I bet there are things that are affected by the nullverses that we lose going through them. they are not simple Voids after all, but very hot places, so thermophages wold get a mouthful, whereas regular temperature life would get boiled. Plus, while I fully endorse my previous idea of computer scans to check for black rods before sowing any footage to humans, I feel that some universe will hijack our computers also, and infect whatever electronic systems connect to them. it is impossible, in short, to avoid all risk. It's worthwhile to take reasonable precautions against typical threats and certain unreasonable precautions against unreasonable threats, but unreasonable precautions against all threats are excessive.
So, what threats should we guard against? Well, what threats have we encountered?
The Altered
The Lurker (black rods, human conduits. easily enough countered)
Corrosive verse (present precautions worked
MindFuck (Video feeds with delay and unconsciousness seem to be the way to go)
Spider HMRC (I bet they are their own worst enemy, but if not, well there are many options)
Ghostverse (well, itdidn't seem actively to interfere with us so, no worries?)
thermophages (how about NOT sending them into boiling hot protouniverses during our initial encounters?)
freezing (standard Mk 1 is sufficient for this and for lava)
whatever sliced that one probe in half
Whatever made our robots and sods grind against a wall looking for home
nuclear decay from the universe where elements seem to dissolve into lesser elements.
uh .. I bet I am missing some already encountered threats, and I am definitely missing some very possible threats, like aliens (noncosmic entity type) or humans.