ARC is slower than tracing GC as all benchmarks where Swift was used prove.
Biscuit was a research project whose goal was to get the thesis done, when the thesis was done, no more effort was spent.
Bing was powered by Midori for the Asian countries for part of its life, and Joe Duffy has stated in the RustConf keynote that Windows Dev team was a reason why Midori faced so much internal resistance, even when they were proven wrong.
Before Google was willing to put the money into JavaScript many would assert that JavaScript would be worthless to anything besides form validation and DHTML.
Mainframes to this day still make use of their own systems programming languages, way safer than C, and you don't see people crying that their kernels are too slow.
In fact, Unisys uses this fact to sell ClearPath MCP to customers that value security above anything else, Fort Knox style.
