Reasonable bail, which is guaranteed by the Eighth Amendment, is probably one of the most important guarantees in the Bill of Rights.
Jail release is more than personal convenience. It's also more than in the best interests of your job and family. It's even more than the best thing for your mental state. If the defendant is incarcerated, it's almost impossible to mount a successful defense.
The presumption of innocence is the foundation of any criminal defense case. But if the defendant is in jail, that presumption of innocence essentially becomes a presumption of guilt.