They didnt step down because things werent moving at a faster pace, though this indeed constituted part of the reason, the main issue was the outright condescension shown by other maintainers towards Rust devs, treating them as something lesser, not merging patches for months despite Rust maintainers sucessfully running that patch and showing some impressive gains, and the whole thing came to a head with that conference talk where those C maintainers basically talked down to the Rust ones, not letting them get a word in and basically bikeshedding them. I have been following the mailing list sporadically and from what I've seen, its some basement dwellers trying their absolute best in stonewalling any progress in a rust port out of some misguided worship of C