Oh, so you're saying the Pulverizer is better except for IC2 projects? Gotcha... And there's a much better way of doing overflow that almost no-one does, that is simply voiding the cobble before it enters your sorting system. Guess what? Mining turtles do exactly that, they can avoid mining 90% of the cobble by simply using the Compare function. They can also ignore dirt, sand, and gravel. If you like, you can even add a Compare/Drop function after every time they go to the chest to drop the items, so that they drop any cobble/dirt/sand they've collected whilst mining, so that ALL that's going to your sorting system are Ores, Gems and Dusts. That is just one of the reasons why turtles are the superior way of mining.
You say UUM is creative mode? I digress. You need a lot of infrastructure set up before you can even do something meaningful with UUM, and to fuel big projects, you need some serious energy production setups.
Using AE to keep a buffer, that i can get behind. But it's not always that you have enough of whatever you need. Sometimes you need to macerate a lot of cobble to turn it into sand, to be smelted into glass later. Or you need a lot of Blaze Powder, but all you have are Blaze Rods. Etc... Oh, and guess what? The best way to smelt stuff lightning fast is also IC2, it's called induction furnace.
The Pulverizer does not obviate the need for a macerator in any and all cases. There are at least a few cases where the macerator is clearly the superior choice, and the more you approach the endgame, the more it becomes so. And what is the point of playing in a modpack if you don't use every mod to it's potential? Completely ignore IC2? Why? It offers you a load of options that cannot be found in other mods, such as UUM for instance, and early game flight. Also the best armor combo which is the Quantum Suit, which requires the Nano Leggings which, you guessed it, requires TONS of macerators.
And, finally, diamonds out of coal. It's a stack of macerated coal per Diamond. And you need a compressor for it. It would be foolish not to add such a useful recipe on an AE network, and to macerate the amount of coal needed to request, say, 10 diamonds? Yeah, better get that macerator up and running.
You didn't address my points, you didn't disprove my claim that the macerator is a necessity, or rather, something to be desired, in a lot of situations. It's not something that can be completely replaced and obviated by the Pulverizer. It's, in fact, something to be used along with, and in addition to, the pulverizer, in many a setup. Normally what i do, is start with a pulverizer, and once i get a massive income of ores, change it up to macerators, and sometimes, i still keep some pulverizers in my system for some of it's more advantageous recipes. The best thing to do is not choose one or the other, but use BOTH, to full effect.