The standard UA lav policy announcement says in essence, "This aircraft is divded into three (or two) cabins. We require all passengers to use the lavatories in their ticketed cabin only, to avoid congestion in any one area."

Am I missing something, or is this just bogus?
If they actually wanted to avoid congestion, the best way would be to OPEN all cabins to transit, as passengers waiting in lines for lavatories would automatically move to the shortest nearby line, until all lines were about the same length.

Preventing transit between cabins actually guarantees congestion in the "one area" with the lowest lav : pax ratio (ahem, economy?).

I can understand that UA actually wants to prevent congestion in the premium cabins only, but shouldn't they find a smarter way to say it?

On one recent flight I took, the FA said "to respect the privacy of each cabin," which made much more sense. But then he followed with "and to avoid congestion in any one area." What gives?

Maybe this is why the announcement now also includes the "security" excuse, which although similarly implausible, is at least possible. In theory, terrorists could meet to strategize by congregating near the lavatories. But preventing transit between cabins could not possibly serve to "avoid congestion," even theoretically.

Am I missing something?
Did the UA scriptwriter not take any economics? Or did he/she know that the announced reasoning is totally fallacious but bet them most passengers would be too ignorant to figure it out?