That performance argument never was a real issue for most applications anyway. You rarely have context switching as a bottleneck in a run of the mill web app, usually it's suboptimal queries, accidentally quadratic naive algos. I think even memory access patterns are more of an issue if you are compute heavy. Considering that "performance" matters at all for the applications purpose. Not everything is a high throughput load balancer.
And somehow all these programmers who never care about performance because “computers are fast” become micro-optimizers, willing to restructure every line of code to save a few KB of RAM and rare handful of ms for a context switch.
