That's true if it's the right value and you don't leave the cells on charge for days on end when you forget about it. It's the way I use on my RC models because it's less stressful to the cells. But I don't leave them sitting for days. Only overnight or overnight and a bit.

A lot of the peak detect chargers also have a post cut off slow trickle that can be left on for days at a time with no damage other than it keeps them at their peak. For most busy folks that may be a better option since it removes the risk of forgetfullness.