Other coronaviruses can infect the nervous system. In fact, there were papers out in 2018 describing neural infections by "human coronavirus".

Cytokine storms and their associated effects (like clotting ,etc.) are also present with other viral infections, like with the original Spanish Flu H1N1 strain (during the infamous "second wave").

"Regular" pneumonia can severely weaken you for months or a year, even if you have antibiotics.

This virus is absolutely not a magic virus. It is novel, but it is still a coronavirus.