I mean, they were pretty good. The founding documents addressed many problems that been seen in British political history. I think they may have lacked tools to prevent two party rule, but some were aware it would be a problem.
From George Washington's presidential farewell address: "However [political parties] may now and then answer popular ends, they are likely in the course of time and things, to become potent engines, by which cunning, ambitious, and unprincipled men will be enabled to subvert the power of the people and to usurp for themselves the reins of government, destroying afterwards the very engines which have lifted them to unjust dominion."
Washington’s farewell address is exactly what I’m referring to. Hoping that people won’t form political parties rather than understanding that they are the logical result of the system that’s been created. No matter how nicely you ask, parties will form.
Just as another example, the Framers forgot to even mention that courts could strike down unconstitutional laws, causing a political crisis that came up only 15 years later. Oops!
From George Washington's presidential farewell address: "However [political parties] may now and then answer popular ends, they are likely in the course of time and things, to become potent engines, by which cunning, ambitious, and unprincipled men will be enabled to subvert the power of the people and to usurp for themselves the reins of government, destroying afterwards the very engines which have lifted them to unjust dominion."