Well, as the decision was unexpected, the Biden administration stepped back to evaluate before appealing, and they are appealing.

She actually took the cafeteria approach in looking at the CDC authorizations. She emphasized those that could support her decision and ignored other aspects altogether. For instance, when the CDC was created they knew they could not be able to anticipate future measures needed to protect public completely, so a part of their mandate in nonspecific, as in "take any other measures deemed necessary", which she totally ignored.

A bit of hesitation in appealing is that it would go to the 11th circuit which has a strong conservative bias, as does the next step in appeals, the current supreme court.

What her decision has done is basically taken away government authority to take action in any future disease outbreaks. For instance, if the had an outbreak of pneumatic plague (air borne black plague), which has killed at least one third of the population (some estimates are as high as two thirds) in the past, the government's hands would be tied in trying to contain and control it.

Covid-19 was pretty mild as pandemics go. Making rulings and policies based on Covid alone will ultimately be disastrous for humanity.