I mostly agree, but if we want to be pedantic, this didn't regress something so much as fix horrible performance for 90% of apps and introduced a previous non-e

I mostly agree, but if we want to be pedantic, this didn't regress something so much as fix horrible performance for 90% of apps and introduced a previous non-existent bug into certain applications due to a non-thread safe bug. The solution itself turned out to be simple enough, and the time it took to fix is definitely not excusable considering the effort vs impact IMO.