Yes and no.
Some months ago (or years?) I tried Mastodon for a total of 5 minutes and didn't understand it, so I left. That time I didn't really know that Mastodon was federated and if I had known it was I didn't know what it meant.
With Lemmy I'm understanding the concept a little bit more. Also I am aware that I can comment while on a Mastodon account but so far I've tried everything and I still have no clue how to do that, my smooth little brain can't comprehend that yet.