Flat out conservatism could NEVER be the reason. And restaurant/bars are such high-margin money machines that change isn't really a risk, right?
I point out that the so-called 'network effect', when actually tested, doesn't happen. You say that because the change had to forced proves its real.
I point out that when choice exists, the network effect doesn't.
You say the 'network effect' prevents 'choice'. The 'lack of choice' proves the 'network effect'.
IOW:
if A, ~B
if ~B, A
so -
If A, A