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They came up with the best thing they could agree on at the time. They did not intend on it to become sacred, untouchable, and without the ability to change with the times, and sometimes we have changed it. Just not quite enough times.
It may be one of those myths, but I remember that one of the founders initially were proposing the constitution to be rewritten every 10 years.
19 years, in a letter from Jefferson to Madison.
To James Madison from Thomas Jefferson, 6 September 1789
He thought that firstly no document or law could be forever relevant, so it needed revisioning occasionally, and the 19 years seems to tie into the idea of each generation taking a new look and either accepting existing laws as still good or making changes.
The French Revolution created an easier method for reforming The Republic and rewriting their constitution.
They enshrined the revolutionary aspects of revolution instead of its leaders.
That said the Federalists got part of the idea from ancient Lycia on having proportional representation and then added in keeping it in check by another chamber with equal footing.
https://www.bbc.com/travel/article/20230906-the-ancient-civilisation-that-inspired-us-democracy
It is a good idea. But we need more Congresspersons to lower the people each congressperson represents. It was ~95,000 in 1940 ... in 2020 it is closer to 750,000 per congresscritter.
They came up with the best thing they could
Bad people with bad motives create bad systems of control.
That's easy to say centuries in the future where so much has changed. What would you have suggested given their experience and history to that point? Be careful, because what seems like a morally just and simple proposal would have been accepted a lot differently then. The "bad" motives were to find a common ground for very different colony populations, and it had to start somewhere. And they tried something that hadn't ever been tried, so don't condemn them too quickly.