The governors were the ones deciding to shut things down. But Trump did go along with doing a stimulus as a consequence of those shutdowns.

The answer to the question of why didn't Trump get more done is he didn't know how to win senate races, and didn't know how to get what he wanted out of the senators he had. Biden of course is not great at this either, but he's better than Trump, clearly. Saying "I'll veto the budget if you don't give me what I want" wasn't credible to them.

Biden’s tactic was to give a hugely ambitious and specific budget request and see where it went, how much they wanted to change it, even if they just talked about it until next year. Submit the same things again next year. This is what Clinton did over and over, and Bush too, and Obama in his first year. When Obama decided to quit that tradition, Fox News howled about it. But Trump didn't bring it back. Biden did. Maybe that was Trump's mistake. No way to really know.

---