Some of my tennis instructor friends have told me that it would be simpler to teach kids, for example, how to play with two forehands than the traditional forehand/backhand combo. Let me elaborate on what I've found (as Professor Tennis - Physics of Tennis) along these lines:
(1) Some children find after playing two forehands, that their "opposite" hand is their true power hand. Yes, some kids are influenced by their parents to play a particular hand, when in fact, their opposite hand is dominant.
(2) Playing a second forehand assists the player in developing a more powerful and accurate two-hand backhand. Quite simply, the two-hand backhand is really a choked-up forehand.
(3) Learning to play a second forehand develops coordination and power for both sides of the body, which comes in handy for the traditional one-racket game.
(4) Playing a second forehand can lead to the development of an ambidextrous serve. What right-handed player wouldn't want to serve left-handed in order to bolster their game.
(5) Playing a second forehand may be just what the doctor ordered in the case of a player sustaining an injury, perhaps even a career threatening injury. Knowing how to play with that second hand may make for a new chance at the brass ring of tennis.
Professor Tennis - The Physics of Tennis