By all accounts the term Bitcoin maximalist was first termed by Vitalik Buterin, which begins to tell something within itself.
I’m not going to try to agree or disagree with Balaji directly - it’s somewhat over my head.
For me though, it comes down to the question- does Bitcoin have meaningful digital scarcity? I think it does, so am a Bitcoin maxi almost by definition. Since nothing else will match that meaningful digital scarcity- or the digital scarcity wouldn’t have even existed in the first place. Knut Svanholm nails this best.
So call me a maxi- if you like - but bitcoiner probably an easier term. I’m not sure it needs devotion to take this stance and purely to think that Bitcoin might be a better form of money than we’ve had before.