Completely get all of your points, and respect them. I think on the spectrum of bad to perfect systems, I see the UK as “good” - but a long ways from perfect too. The US however is just obviously bad, and I think moving towards the UK’s system would be a massive step in the right direction. Personally, I think the first step is that the private companies should not own the rails themselves, they have proven that they are not the proper stewards of those systems and should not own that.
That’s step one. After step one though, I completely see your points and that there would be a lot of details worth looking into.
And, as someone how has ridden the Azuma service from London to Edinburgh 4 times - I have seen it cancelled twice. Ridiculous that in my very very infrequent trips to the UK I have seen my train trips cancelled just as many times as I’ve ridden them.