Of course you are right Jazz, It is a judgement call between possible extremes. I have entrances around two inches wide and maybe half an inch high on most colonies (including double brood) all year. Under wasp attack the conventional wisdom is to reduce to a single pencil diameter to allow the (probably much reduced) guard bees a chance to defend. At the other end, a national “normal” entrance without a block in is a gap well over a foot wide and up to an inch high, which for most of the season is way over necessary provision and gives guard bees an impossible job to monitor and defend. Common sense for me is a reduced entrance all year round much closer to what bees choose for themselves. Personally, I don’t have a problem with some temporary congestion around the entrance at peak times of the day at the height of the season. It is usually only for a limited period and indicates for the rest of the time they are well in control of access. Congestion around the entrance at such times is what you usually see with feral colonies as well.
In spring it may indeed not matter but in August / September around me a fully open entrance would cause havoc, we are in orchard country, wasps are very common and bee neighbours will rob out any neighbours they think worth a go.
Indescriminate and punitive wasp traps are simply not the answer to over provision of hive entrances.
When I started beekeeping I did what the old guys did and put out jars of jammy water and watched as they filled up with dying insects including wasps but also many other blameless species as a by-catch. And I still suffered colony losses by wasps.
It just felt badly wrong. Hence looking for a way to prevent the issue arising in the the first place. Which is thankfully incredibly easy to do for most full sized healthy colonies.