The Constitution built a government with multiple checks and balances. It was MADE to be confrontational and they wanted it to be extremely difficult to pass laws. They realized that government will feed itself and grant itself as much power as it can grab. They worked very hard to set up a system where that would be difficult. And it worked for about 100 years. Then the corruptocrats began their work, and we see the result now.
You bring up checks and balances but ignore how those checks and balances are resolved
They are resolved by COMPROMISE.
The President will advocate legislation but must compromise with Congress to get that legislation passed
Congress may pass legislation but must compromise to avoid a presidential veto
Unlike what our board conservatives are preaching....GRIDLOCK was not the intent of our founders