Drivechainers claim that miner incentives on L1 wouldn't change, just increase profits.

From my understanding their claim sits on the idea that any sidechain created still uses bitcoins, and the only way to get bitcoins is by using the mainchain.

Also, I'm not sure about everyone up in arms about "shitcoinery on btc" as new tokens aren't necessarily created - rather just trustless pegging in Btc & then peg out just like LN.

Introducing a bug on the mainchain is what everyone is always worried about, as am I, but if we look at previous code changes,

Taproot,

Segwit,

There have been no critical bugs, & these upgrades were highly necessary imho.