I'm going to go a bit off-topic from the conversation happening right now and focus a bit on the main post.
Honestly, I'm not the biggest fan of RotaryCraft or ReactorCraft (still, I find you an incredible modder, Reika
), but this answer counts to any mod out there right, from those stupid ones that only add obsidian tools and extremely unbalanced overpowered machines, to those that we all know and love, like RotaryCraft, Applied Energistics, Thermal Expansion, Industrial Craft, Thaumcraft and others.
In my ignorant opinion, I think that mods, not only Minecraft ones, add not only content, but possibilities - being RotaryCraft such a big mod, he's full of them, I'm sure! And what you do with all these possibilites mods offer you, is completely up to you - and only you! Isn't that awesome? I'm sure all of you here have seen a bunch of different and neat builds, made from those possibilities, and interactions between them - from factories to huge moving mining machines, they are all over the place! It's unimaginable what people can do with all this content, with all this possibilities.
Isn't giving people more possibilities what the whole modding community is all about? RotaryCraft, and a bunch of others incredible, breath-taking mods have the point of giving you infinite
possibilities - it's almost asking you directly: "What can you do with me?"
I found that truly,
truly amazing.