The earlier its diagnosed, the more severe it tends to be. If someone has schizophrenia triggered under the age of 25, the massive shift in the balance of neurotransmitters has a significant effect on the continuing development of the brain. The frontal cortex (the executive function, intelligence/wisdom, and common sense part of the brain) is the last part to finish developing. That's why you can have teenagers and college-aged kids that are extremely smart academically, but absolute morons when it comes to decision making and self-restraint.

Schizophrenia is characterized by massive overloading of dopamine to the point that the brain malfunctions, and the medications used to treat it (anti-psychotics) mostly work by dulling the effects of dopamine and limiting its production. Finding the right anti-psychotic and right dose of that drug can take a lot of trial and error, and that's all time lost for ongoing development of that person's brain. Dopamine is a very important neurotransmitter, so if someone has severe schizophrenia requiring strong dopamine inhibition, they can end up with a lot of nasty side effects.

The medications have long term effects too and there's kind of a maximum amount of time you can be on an anti-psychotic before you start having a form of medication-induced Parkinsonism. If someone's schizophrenia gets triggered then diagnosed and treated earlier, it means they are going to start having those Parkinson's symptoms that much earlier.

I'm not sure that finding out by having an episode triggered that results in hospitalization is a good thing.