There are pros and cons to each selection process. The US version seems like an absolute slog, and back when it was even longer and more demanding, we saw the consequences of it with gymnasts who were injured or just not able to perform at their best when they had to be peaked for 2 straight months over 3 competitions just to secure their spot, and no down time because the Olympics are 2 weeks later. The elimination of the ridiculous camp selection ameliorated that somewhat, but it’s still a bit of a brutal road. Classic, Nats, Trials, Olympics is a lot on a very compressed schedule. 4 competitions in under 3 months.
Selecting early at least gives you the opportunity to maybe ramp down a little bit after selection and really aim to peak at the Olympics. On the other hand, you risk not picking the best team because people don’t want to peak too early, injuries that may heal by the olympics, etc.