My favourite OS is Haiku which is permissively licenced (MIT)
What is the 'authoritative' nature of GPL? It's licence, a set of conditions for use just like any other licence.
As for why I think GPL makes for a better licence to cooperate under for companies I've made that clear also, which is that companies is generally the equivalent of the most selfish greedy person you can find and they pretty much never want to give anything away, particularly when it can gain a competitor and this is where the GPL comes in handy.
And it is sad, I've read numerous times of company representatives saying they've saved up so and so much money from using open source. If they would only donate a small percentage of those savings back then I have no doubt open source in all forms and licences would flourish.
Of course you don't give a shit about this either way since you are just here trolling.