Bitcoin ABC literally stands for “Adjustable Blocksize Cap”, but the miners set the cap not an algorithm like in Monero, I have not read any convincing argument against dynamic blocksizes as given enough demand over time the blocksize cap will increase, I think they don't adopt it for the same reason stealth addresses are still not adopted even while completely possible with the Bitcoin codebase, they would be admitting defeat against the Cryptonote codebase, then why not just use Monero?