This is (modded) Minecraft. You're not allowed to tell people that their problems with lag and poor performance might possibly be related to badly outdated hardware. It's a law written somewhere or something.
Just like I'm not allowed to say that Redpower creates no lag issues for me whatsoever. To the reader, that is the same as saying, "I am superior to you in every way." Nobody ever takes a contrary point of view in the spirit that it's offered. It's either, "You agree with me and are therefore welcome to join our circle jerk" or "you disagree with me and I must therefore find ways to try and make you feel bad."
I see the Let's Plays. I see the relentless stream of imgur albums on reddit. Joe Average modded MC player just doesn't really know what they're doing. If they have any kind of automation at all, it's usually a sloppy hack job that's pointlessly convoluted. They insist on using the worst possible combination of power, transport, and processing "because I like <mod x that has shit machines>". Then when things don't work, it's someone else' fault. Sometimes a person can simply learn what works well and put their own twist on that and all of a sudden the, "Why does my crap not behave the way I thought it might" fiascos and "dag nabbit mod dev you ruined my life" contrivances would be far less frequent.