Normally, I'd agree with you on this. However, given Trump's unpredictable and questionable mental competency, I can see them withholding information. Trump said wind turbines cause cancer, he showed he would rather believe Putin and the Russian intelligence community than our own CIA and FBI, suggested ingesting bleach to fight COVID, and other wild, false, and crazy statements. They probably feared he'd order a nuclear strike on China due to a balloon over-flight. As a matter-of-fact, Joint Chiefs Chair Mark Milley and China both feared Trump would do just that, simply because he lost the election. Even our allies opted to withhold intelligence from Trump, as they didn't trust him to not hand it over to the Russians. Simply put, he was too much of a wild card. So I have no doubt, not just the balloons, but other stuff was necessarily kept from Trump as well.