It's been nine years since the chain split, which happened within the first year. No irregular changes have been made since then. Two major hacks caused over a hundred million dollars in losses to Parity, a company founded by one of the core devs. That dev lobbied heavily for rescue, and the community refused.
Bitcoin also made an irregular change, a year and a half into its history.
Listen, this is all code running on computers. At the end of the day everyone could choose to shut it down or replace it entirely and they criticism would still be: See not immutable! Eventually entropy makes everything mutable.
Bitcoin also made an irregular change, a year and a half into its history.