I think Socialist-led states have observed failures and made changes to survive and thrive. they write it down for posterity and we can use them to teach us what did and didn’t work. the problem seems to be that most refuse to learn from it because lenin, or stalin, or mao, etc. are authoritarian^TM^ so their work is automatically disregarded and people like sanders, aoc, piker, platner keep repeating the mistakes of the past.