That is one of the reasons I like the Sig LT-40 so much for a basic trainer. People can't believe how well it flys when I use one to do outside loops, snap rolls, spins, and fly around inverted. The dihedral is fine on most trainers with the possible exception of the PT series which had too much. They would fly better if you just took the radio out and glued the control surfaces solid. They did change it finally, but the designer (a guy I knew) blew it badly.

However it is an often made mistake to think that you want to remove the dihedral from all designs. A little thing called adverse roll happens with low wing models and no dihedral or too little. In other words, application of the rudder one direction make the airplane roll the other direction. It's a combination of wing placement fuselage surface area, and dihedral that determines what happens.

In full size airplanes designers want proverse roll which means left rudder make the airplane roll left. The solo exception would be unlimited acrobatic aircraft where the goal is no coupling. Of course those guys usually wear a parachute. But for general aviation, the FAA kind and of wants a redundant control system for direction and pitch. Over the years I have had quite a number of servo failures and even a structural failure and control system failure after a mid-air where I was able to save the airplane because of knowing a few tricks and how things work. But then other times all you can do is watch!