would you learn to drive in a porsche/ferrari?
I think the issue is not about the performance of the aircraft but performance of the person learning to fly. Even fighter pilots learn to fly on light single engine pistons. Once you have got the basics squared away, then move on up.
With regard to legalities, I think it will depend on whether the aircraft is approved, i.e. it needs to be public transport category in the CAA. My advice - go to a flying club that feels right, with instructors that feel right and learn the pitfalls of flying. Treat them with respect then you will have the platform on which to do differences training for any high performance aircraft that you may wish to purchase.
Personally I have instructed on cessna 152's 172s, Piper PA28s, 38s, Robins, but not the latest trainers eg Katanas.
My favourite aircraft for instructing and learning, easily the PA38 tomahawk. Since then I have flown Fireflys, Bulldogs, Yaks, Caps, Dassault Falcons, Boeings and the Airbus. I still utilise the basics learnt on the PA38.