I use wet/drys so I have plenty of O2, more than most tanks.
So I can go either way with the surface movement.
Still, surface movement does help in a few respects, if the CO2 adjustment is too high, then the rates of degassing are higher and the O2 is maximizes...........
While true........you lose some more CO2 this way, the effect is NOT pronounced if the movement on the water does not quite break the surface of the water.
In general, people will KILL fish if they add too much CO2, and get algae if they do not add enough or have troubles with various plant species.
More surface movement added a much needed buffer if folks add too much CO2, plant issues and algae can be fixed, bring fish back to life cannot
So the error must always be given to the fish.
You can see the surface movement on most of my tanks, but...this is not to say that low surface movement does not work either....but you never see high stocking loads in such tanks either, always curious why that is........
You can reduce the rippling also and still have decent but flat current and exchange, this does NOT drive off a significant amount of CO2.
If there was no CO2 or plants, would this advice to have no current apply? Why not??????
Plants add a little O2....but not that much.......tetras and many of the more common fish kept in the top aquascapes tend to be VERY CO2 tolerant/low O2 demanding.