411A
Quote <Quite simple really...when down to alternate + reserves fuel, divert>
Wrong --- It's about making command decisions armed with all the knowledge that comes from all sources available and at all times never prejudicing safety. That means that if everything is legal and sensible then commiting to your destination is both permissible and sensible from both commercial and safety viewpoints.
As has been said, diverting from a multi runway airport with fully functioning nav aids and with reasonable weather to an alternate with a single runway and similar weather when you have been passed an estimated approach time and will land with at least reserve fuel is not the best decision.
What is your problem with that logic, exactly?