IMHO …When I took a look at Stacks, it appeared to be similiar to about 90% of the crypto space. A bunch of vaporware mumbo jumbo. Perhaps though your research will offset the following criticism…
No scientific paper describing consensus protocol.
No soundness or liveness proof.
All I found was a rather light explanation of the PoX consensus. (Proof of Transfer) . What is the connection to miners? Who knows! Block producers bid for the right to create blocks by transferring bitcoins to another group called stackers. The motivation is STX but it gets convoluted when you dig further. I do like the ‘Hard Fork to Proof of Burn’ scenario. Sounds like film noir.
The Stacks 2.0 native currency is not Bitcoin. There is not even a wrapped-BTC token as far I can tell.
There is a STX token and the developers want folks to lock it for a long period… obviously.
They do use ‘Bitcoin technology’ to secure consensus so they have a Bitcoin blockchain oracle I think.
But I give a thumbs down to their ‘built on Bitcoin’ shtick …