Yes that is wrong.

There's a reason larger Nitro planes and Helis are still the primary training vehicle used by most club programs.

Their larger sizes tend to give more reaction time to the pilot, while presenting an easier to see frame, less buffetting by winds, ease of getting back in the air immediately, etc. etc. etc.

When people show up with electric trainers at our club sessions, we put them on Nitro planes until they have soloed, then help them through their first electric flights.

Not only do I do this, but I'd put an utter novice ( with a buddy box ) on my Big Stik .60 before I'd do the same with a small electric trainer, if I want them to learn proper techniques.

While larger electric trainers are starting to become a reality, the associated costs for a 40-60 sized setup and sufficiient packs for continuous flying, still makes nitro planes the instructor's choice.