I happen to agree with you that the deficit is Trump’s only economic failing, but I also remember why.
The Dems have never seen a deficit that they didn’t like, and even with the GOP having a majority in the House and a razor thin majority in the Senate in his first two years, Trumps initial proposals for a tax cut with deficit reduction were torpedoed (as was his repeal of Obamacare).
Trump literally said, “Fine. I can’t do anything about fixing you, so screw it. I’m not going to go down after one term because of you”. He gave up on it.
One could argue that charging the economy first was a good plan, and that the deficit could be attacked with increased revenue I suppose. Either way, this is an issue that I do think will need to be addressed in the next four years quite seriously, and I doubt either candidate will run on it this election.
I will say that it is an issue whose fix is far more suited to a president in his second term given the impact that it will have on potential re election.