I used to completely agree with you on that topic (and still would be if it wasn't for the BioPellets).
My pH has been on the low side since using the pellets and I've been dripping kalk at night whenever it drops below a certain point to counteract the CO2 that is a byproduct of the pellets converting nutrients.
Of course I know the pellets are converting a lot of nutrients because I am putting in a lot of food but hey that's why I got the pellets: to let me feed like I want to.

Not everybody using pellets will have such a big nutrient conversion.
If it wasn't for the pellets I would still be very happy with an undersized skimmer.
But I think with the pellets and especially with how much I feed and the resulting CO2 production by the pellets a very effective skimmer is a must now for me.
I am even more excited about the spray injection method this morning than I was before.

I usually go through 2 gallons of kalk a night to keep pH where I want it. This has been the first night with the AquaC on and I just checked on it: I used only 1 gallon (half of the usual) and my pH still is perfect.
I assume the difference must be one of two things (Or both):
- fantastic aeration capacity compared to my correctly sized ventury Elos and undersized needlewheel AMS skimmers
- faster, more effective waste removal so the pellets have less to chew on