SREs predicated Twitter would crumble when Twitter's SRE team was laid off. It had some hiccups, but seems stable now.
I suppose the next line of defence is that it takes a while for architecture to crumble.
Time will tell whether that's accurate, or a No True Scotsman.
My position is that early SRE solved the hard parts, before I was involved. Services and platforms became reliable. The field is mature. SREs still point to risks, but execs have called their bluff.
The takeaway is to make sure you are actually creating value. Maybe Twitter's SREs were not actually improving reliability much.
I think SREs knew better than to claim such. I saw tons of non-SREs claim that Twitter would surely immediately collapse. Then the 2022 FIFA World Cup occurred immediately after the mass layoffs ... and Twitter kept on working.