Yes that's true. Most of the Left Hand drive world is former British colonial. Except for the population size of India, the vast majority of the world drives on the Right. If a company wants to produce vehicles, do you incur the expense of an entirely separate build process for a small minority of the population? Some might but most would pick the majority and build for that.

except for the pollen. Nanopores / tiny holes seem like they'd get fouled up by dust and things pretty quickly.

really interesting idea, just wonder about the real world operating environment issues.

The long tail of global colonialism ;-) https://en.wikipedia.org/wiki/Left-_and_right-hand_traffic

Also, while not entirely accurate, an even older history, ahem, driving, the modern world http://www.astrodigital.org/space/stshorse.html

Without India I suspect Driving on the Left would be relegated to history books by simple economics.

Though with EVs a lot of the production costs of doing both could be eliminated.