But you can share torrent links via onion hidden service easily.

It has been a few years since I last used Tor, but even back then you could download at megabit speeds over the network. I would assume that the situation has improved, I’m surprised that you seem to report the opposite.

The speeds are usually bad because exit nodes are more rare. But Onion addresses don't go through an exit, and stay within the Tor network.

This wasn't even true 10 years ago...