If the UK had made a success of HS2 (difficult to imagine with governments in much of living memory, but let's sidestep all of that) then it could have been claimed, perhaps with some merit, that the UK was able to do something with rail infrastructure that the Swiss could never because they were hamstrung by their approach.
If the facts of the situation were reversed, of course we would draw the reverses conclusion. That golds true for just about any argument.
The UK's inability to build is apparent everywhere – our extreme lack of house building, our lack of modern nuclear power stations, our sewage system operating beyond its capacity, poor national transportation, etc. If HS2 was an exception to the rule then I doubt there would be this much focus on it. HS2 is just the most costly and extreme example of the problems we face when it comes to major infrastructure projects.