Prompt pretrial release is an essential component of a good criminal defense. Typically, defendants who are behind bars do not make good decisions, usually because the increase stress hormone production interferes with the thought process. In practical terms, defendants who are in jail often accept unfavorable plea bargain agreements just so they can get back to the free world.
In a handful of cases, pretrial release is probably irrelevant. Defendants who are charged with Class C misdemeanors and have no work, family, or other commitments will probably plead guilty and receive a brief jail sentence. In many cases, the time served may cover most or all of that sentence.
During jury trials, incarcerated defendants almost never appear in jail clothes or shackles. Even though judges tell jurors that pretrial detention means nothing in terms of guilt or innocence, there is a very real presumption of guilt if the defendant is in jail.