I wonder if United has too few staff and planes to handle demand all of a sudden. In 2023 I took a shocking # of flights on other airlines because United was almost always by far the priciest (either $ or miles). I can only assume due to being fully booked all the time. I looked for some Florida flights for this year already and as an example AA wants only 40K miles for a one way flight (3 people), United wants 100K miles for the same day/time of day... Crazy.
It's a bit of an outlier, but for the AWS conference in Vegas this year (~65K conference goers) my United flight was already literally half+ full with pre-boarding and Gold (group 1) and above business travelers. It was crazy to see so many 1K, Global Service and above status holders boarding ahead of any formal boarding groups (normal for my flights might be ~5-10). That said, more than one of them screwed up for
seat upgrades since I was still in Premium Economy section on that flight despite only being Silver on United and many dozens of them having much higher status.