To ensure the adversarial system works as well as it can, the accused must have counsel at least on par with that of the Crown. Mismatches of lawyers at trial is the stuff of Deep South murder trials in the USA. There some accused, unable to afford sufficiently experienced lawyers in an environment of little or token legal aid, can be represented by law students or destitute lawyers willing to appear for all in fees of a thousand bucks to defend an alleged killer heading to the electric chair.
"You're not going back into the community. The community can't afford you. It's quite clear that you and your family are not going to pick up the damages for what you've caused. And, presumably, and I infer this, you've got no understanding of that. You don't know what a first world economy is." Judge Greg Borchers, Tennant Creek Youth Court, 6 June 2017