Related:

Immutability Changes Everything (2016) - https://news.ycombinator.com/item?id=27640308 - June 2021 (94 comments)

Immutability Changes Everything - https://news.ycombinator.com/item?id=10953645 - Jan 2016 (4 comments)

Immutability Changes Everything [pdf] - https://news.ycombinator.com/item?id=8955130 - Jan 2015 (25 comments)

(Reposts are fine after a year or so; links to past threads are just to satisfy extra-curious readers)