I am almost certain the feature was there back in 2018 ;) Also, I think there was a warning, something like "use Convert only if SBD < $1.00"

I see "Convert" just as a tool. Some loose their life savings over night by margin trading and still, it is out there, available to everyone.

The more features, the more people would be interested to join/stay. Imagine if any of the biggest crypto exchanges decides to have spot trading only and strip away all other methods of trading. Many will move right away to the competitors I guess. ;)