So, I'm a produce buyer for a grocery store in the Northeastern USA. The vast majority of fresh figs in the USA supply chain are Black Mission. They're also the best, at least by the time they get here. Brown Turkey are also available, but rarely carried at grocery stores. Kadotas and Adriatics are also available, but much less common.

The conclusion may well be true but as someone who doesn’t regularly eat figs, is it the case that all these varieties are readily available?

After all, there are more than 15 varieties of banana but the likelihood of my picking a Cavendish (conditioned on having picked a banana) at my local supermarket is actually a resounding 100%.

EDIT: To responder, the point is that if you have 5 options, it doesn't mean you have 1/5 the chance of each option. Hence the example with the banana.

A significant chunk of packaged figs that I've seen are black mission figs because they dry well, and are non-pollinated. A lot of the others are smyrna or calimyrna which require pollination.

That question doesn't mean anything. It depends on where you live. The most common types of figs in France are not the same as the most common figs available in Turkey for example.

Well the most widespread around the world is the Smyrna variety. So...

Doesn't need pollinating.. does that mean it wasn't?

self-pollinating would be a better description.