I think you can keep your slow, hard-to-relaunch kites. I bought my Infinity V1 for wave riding. With it, I've enjoyed a lot of waves that only a surfer could love (not blown out by the wind). Sometimes I like to push myself. Therefore, sometimes I drop my kite. Quick relaunch is important.
I really like how fast it turns. Yes, I like the turning of smaller kites better, but the Infinity is also quite enjoyable.
I can see why someone who only wants to mow the lawn on flat water might want a FS or other large, slow kite, since they don't need to turn it or relaunch it, but I want more out of my LW experience.
If someone wants to show me that their kite works better in the waves, I'm certainly interested, but so far on my Infinity, I've either been overpowered, or alone (excluding the occasional FS mowing the lawn on the outside).
On the other hand, I'm not a fan of the Epic Bar. I use an old LF upgraded to CPR. I like it because of it's long depower and really simple design that doesn't tangle when I get worked. With it, I can Power up the kite to get to where I want to be quickly, and turn off the kite instantly to ride the wave.