TennisCJC, for today's mindless baseline-to-baseline, whack-a-mole game, I agree with you. Eastern for forehand and two-hand backhand, especially for beginners.
And, double yes, for serve and for volley, continental grip is indispensable. That's why today's top ten players cannot volley as well as Roche, Laver, Rosewall, Edburg, or McEnroe did.
Salt air, red wine, olive oil, & gaudium certaminis (Latin for "joy of battle").