I, the GP, am Canadian, so have my own system to worry about.[0]
But if you're going to talk about the pros and cons of a country's system, it is useful to a certain extent to look at what the architects were thinking. And in this particular case they did have some insight into the weaknesses of what they thought up.
Another that I heard in a recent podcast[1] was the fact that the existence / creation of political parties was not put in anywhere in the US system (even though they had existed in the UK already), and so you can get into tribalism/clans, which we are now seeing the effects of.
[0] https://sutherlandhousebooks.com/product/the-crisis-of-canad...
Many other latecomer nations didn't enjoy that kind of success - in fact many of them started with their first few presidents being brutal dictators, so they're under no illusion that their own "founding fathers" were infallible angels.
The US is not the first modern democracy; it's just the best at self-aggrandisement.
I think the main 'innovation' was the splitting up of the Crown / Executive.
One failing was not taking political parties into account. It's not like they were unknown at the time:
* https://en.wikipedia.org/wiki/Political_party#18th_century
The political theories/philosophies developed by the founding fathers remain foundational for reasons.
lol, implying you'll find that on HN