The instructor course is just about giving you the bare bones and some ability to teach.
There is no course in the world that can take someone with no experience in a high performance aircraft and turn them into an instructor on it in a couple of weeks. (Mind you I wouldn't call an SR22 particularily high performance.)
It would be wonderful if we could have modern aircraft, good instructing and a sensible "aftercare" package to help encourage people post PPL issue.
Until that happens, most PPL's will be stuck flying the usual cr*p with no help and generally getting ripped off and treated like shi*e.