With FOCIL, if a proposed block ignores valid transactions from inclusion lists, then the chain can fork away from it, guaranteeing that any valid public-mempool transaction gets included within a bounded number of slots.
“FOCIL enables censorship-resistant rapid inclusion of any transaction,” Buterin wrote. “Hence, with FOCIL and 8141 together, anything, including smart wallet txs, gas sponsored txs, and even privacy protocol txs, can be included on-chain through one of 17 different actors (the proposer or the includers) that are all chosen randomly in each slot.”
There is also an important synergy between FOCIL and AA (EIP-8141, which is based on 7701):
According to Buterin, the move “gives guaranteed rapid inclusion,” meaning that almost any valid transaction would be included within one to two slots, even in an “adversarial environment.”
“Ethereum is going hard,” Buterin wrote.
Critics, including Ethereum developer Ameen Soleimani, argue FOCIL could have unforeseen ramifications for network validators.
Still, many Ethereum developers argue that FOCIL brings more benefits than downsides.
“I’m actually trying to do something even more ambitious: Create ‘cypherpunk principled non-ugly Ethereum’ as a bolt-on to the present-day system, in a way that's as tightly integrated and interoperable as possible, and then grow it over time,” Buterin wrote.
