Really anything involving Equivalent Exchange can be called "cheaty". But isnt FTB all about mass production? Even if it does seem a bit cheaty?
While you are perfectly right (imho) - here's the answer from my subjective view about "why not? Even though it is a bit cheaty?". And all this only holds valid as long as we are talking about the settings and possibilities, that FTB has to offer, of course.
Y'know, while FTB
sure as heck is about automation, mass production and literally everything industry wise - it's (at least in my book) not about "put object a in machine b and get object c, where object c may be
anything." See, it's a ruleset. You do not get obsidian out of a rolling machine. You do not get steam out of a squeezer. The list goes on. In a way, all the machines and setups are following a system, or pseudo-reality, check. You need mixed metal ingots, you use the rolling machine. You need iron dust, you use a pulverizer/macerator/etc. You need honey from combs, you use the squeezer. In itself, it does make sense, in the broadest way possible. But apart of the "cheaty" Miniumstone (which I do love dearly, to have that said), there is no way, one could build a "be all end all" machine, where you put in dirt and get diamonds out. Which is transportable and is made (Miniumstone is way too cheap^^) out of three dirt and a stick.
I think you see, where I'm trying to point. Again, that's my personal opinion and in no way a must for anyone elses' gameplay style.