As an SV and US outsider I can definitely see a dismissive-ness towards other platforms. However rather than blindness I see it more as a group phenomena like a

As an SV and US outsider I can definitely see a dismissive-ness towards other platforms. However rather than blindness I see it more as a group phenomena like a 'collective subconscious' that can often drive a meme towards a self perpetuating dominance. The group senses that if they all push together they can create a new dominant platform and benefit from being early adopters. For a time this can lead to the kind of sustained dominance that SV is experiencing but of course nothing lasts forever - just look at the US automotive industry.