Eh, words change and sometimes terms outlive their etymology or grow beyond it. We "hang up the phone" but no phone these days is actually hung up. 🤷

The difference between Europe and Asia should also apply to Asia and India.

Definitely not the Romans. It may have stuck because of them, but the Greeks divided the world that way long before Rome left Italy.

Since continent doesn't have a strict definition, in my book, giving the isthmus of suez (and the isthmus of panama) a pass makes sense. Both of those were historically very difficult to traverse and not viable sustained trade routes compared to just sailing around them. Hell, there's still not a road that links North and South America through the Darian Gap, which is wild to me considering what seems like should be a vital connection point bottleneck.

I understand "continent" a mercurial word and so people can define Europe and Asia as being different contients, but it does seem like it's the only continental division that doesn't make logical sense to me.