The point was to give an example that desktop/laptop computers do not always result in better performance than phones. The GP didn't seem to believe it was pos

The point was to give an example that desktop/laptop computers do not always result in better performance than phones. The GP didn't seem to believe it was possible that a phone could be "less laggy". In line with your own remarks, there are a number of common use cases that have been optimised on phones in a way that they never were on desktop, resulting in a superior user experience on the phone vs the desktop.