We recently had a very long discussion specifically about access tags on barriers. No real consensus was reached but a few people edited the Wiki as a result. It was in the context of that discussion that @Hungerburg changed “Access tags describe legal permissions/restrictions” to
“Access tags pre-eminently describe legal permissions/restrictions”.
I’m sure there have been half a dozen other discussions on access tags vs. maxwidth:physical, that was just the first one I could think of! (Because I accidentally started it)