Is it really though? Why are the courts so inundated with crime that this is happening in the first place? Are there uncomfortable truths not being talked about? Is that the reason why?
The partial closure of parts of the criminal justice system during COVID led to a backlog which in turn appears to have pushed the system to a point it has been unable to properly recover from - there are some very interesting statistics here [0].
As to why that is - the explanations I've seen generally feature incompetence amongst various parts of the system and a degree of underfunding (or perhaps poorly managed funding) - including the fact that there is a shortage of criminal barristers due to poor pay. Juries themselves don't seem to be cited as a huge problem.