Our framers came fairly close to grafting the British Parliamentary model onto the Constitution, in which the House of Commons alone determined spending.
To provide better protection from wild spending, concurrence of the senate and president were added.
Oh well.
They probably thought we weren’t stupid enough to go the party system.
The Senate and President were not supposed to be directly elected by “the people” either. The state legislatures got the shaft, but they have only themselves to blame because they ratified the 17th Amendment.