I consider them anachronistic things that fit the pre-covid version of bitcoin and crypto better. Once you operate on the LN and use its apps enough, you realize drivechains, spacechains, and sidechains have no future. I don't consider them an L2, because I believe all the instances of lightning working together via BOLT spec have been ratified into a single volume like all the books of the Bible were. We call this L2. Moreover, we've had BIPs on L1 specifically tailored for L2 functionality, like the three BIPs that make up Taproot.