Aha. Well, you're right about one thing: sourdough is a symbiotic colony of not just yeast but also LAB. Everything else...
Where do you think the yeast and LAB in your starter come from? Why do you have regional differences in microbial composition? Why do rye and wheat starter have completely different proportions of LAB and yeast? What happens if you change the temperature of your starter during the growth phase?
Go ahead, split your starter, feed one part each with rye, wheat, spelt flour. Now go and take the same flour but grow one at a different temperature from the other. Come back again in three weeks, tell me they're still the same starter.
Your starter is a product of it's surroundings, that is your house microbiota, flour, also water and temperature. And maybe the defining variable is your local microbiota, not the flour, IDK. Doesn't matter.
Source: the starter I bought on Etsy still smells and tastes the same as it did when I bought it a year ago even though I’ve been feeding it my flour.
I highly doubt that a) you have a proper recollection of smell and taste of something you assessed a year ago and b) your senses are a proper indicator of microbial composition.
Source: I studied sensory evaluation methods and conducted studies with several hundred participants.
Also, science.
Lol