Keep in mind, you can't make Fluxed Electrum and Enderium in anything (that I'm aware of) except for the TE machines.
I don't mind steel, bronze, invar, electrum, and the other alloys at all. THAT is a single-step machine, or things like a smeltery that I can batch-process in a manual on-demand setup. Those are fine with me.
The equivalencies are awesome too.
Just avoid making the process too... limited. In AgSkies and CrashLanding I absolutely positively had to use TE. Period. I've done those builds so many times I'm sick of them and there are no alternatives. Things like bronze I can make in a handful of ways and in most any mod ecosystem you want. THOSE are amazing and effective gates. I can get past a bronze gate with TE, or IC2, or Railcraft, or Mekanism, or Tinker's Construct, or AE (though in an AE-only pack that would be annoying without AE2-Tech Addon). Same goes for steel, there's 3 or 4 mods that make steel. Or Electrum. Notice the difference between the "common" alloys and things like Enderium?
I LOVE gates, I hate being forced to go down the same stupid tech tree and automate the same machine that I've automated too many times before because your entire tree past a point involves a single mod material. This isn't a problem with mods themselves, it makes sense for RoC to take its own steel, and Mek to take osmium, and TE to take invar. It becomes a problem when there's ONLY one, maybe two paths to get the material and they've been done to death, resurrected, been polymorphed into a horse, beaten back to death, raised as a zombie, and then beaten again.
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Tinker's Steelworks is a pretty easy way to get steel, so is RailCraft (Though RailCraft is almost painfully slow). The standard tinker's way is indeed not something you want to rely on for production of any amount. Mekanism makes steel as well (at least I'm pretty sure... I haven't played with it in forever).