Well presumably those other cuisines took a long time to develop the good recipes you mention.
It’s not really biologically normal for humans to just up and completely change their culture based on logic. So while Indians have already done the intergenerational work to have good vegan dishes, in the west we don’t have that. Making a drop in replacement that works within the existing food culture does seem like a reasonable hack.
I'd say that proportion of what you might call "vegan" food in india is quite small. Dairy-based products are everywhere in vegetarian dishes, and many (too many, imho) recipes treat paneer as the default stand-in for meat.
It’s not really biologically normal for humans to just up and completely change their culture based on logic. So while Indians have already done the intergenerational work to have good vegan dishes, in the west we don’t have that. Making a drop in replacement that works within the existing food culture does seem like a reasonable hack.