The wet-dry system is only a problem if you are injecting CO2 into the tank. With proper lighting and fertilizer CO2 increases the growth rate of the plants. This is not necessary to have a beautiful planted tank. It just makes the wait time less.
On the flip side if you are not injecting CO2, then a wet-dry system is very good for a planted tank. It allows for maximum gas exchange and getting both oxygen and carbon dioxide rich water.