It is dangerous to be right when the government is wrong. Hitler It is a curious situation. But the way it works is that the prosecution's duty is to see that justice is done, and the duty of the defense is to do nothing. The defendant, as you know, need not testify, need not present any evidence, need not call any witnesses, and may rely soley on the prosecution's burden of proving the charges beyond a reasonable doubt and rely on the fact that he or she is presumed innocent. He or she does not or may not have the resources anywhere equivalent to that of the prosecution, and in fact, may not have a dime.
Resources are important.
For example experts are deservedly not cheap for either the state or the defense. But he or she who relies upon the constitutional protections in this setting is a fool. The system does not work that way. The defense starts out two paces behind for a hundred reasons. Consider a few.