Where ignorance is bliss, 'tis folly to be wise. Face it: you were better off not knowing that, weren't you?
I think most maximalists are either unknowledgable about the possibilities of other tokens or they are just called such because of an argument with an altcoin enthusiast. BTC is the leader of the gang, so it´s just natural that people focus on the main point of interest. Taht´s also shown in the recent developments of big institutional investors entering crypto space, they chose the supposedly most safest asset, whcih again is BTC. It might change in the future but at this point the whole crypto market is still in its infancy so focussing on the Crypto Blue Chips is just common behaviour