Honestly though, how many supermen do we have?
Miya's clearly the most powerful, but there are two factors. One, it cost him a good chunk of his humanity. Two, he's the top-ranked PC in the ARM, so he has kinda earned it.
Down from that we have Jim as probable #2. With a synthbody, two amps, and his perfect decomp with high bonus, he can handle space magic better than anyone else, as well as being fearsome in a fistfight. But SerCon isn't overly active, he's still limited by mindpoints, and isn't invincible besides; getting shot a few times would severely hamper his mobility, if not his offense.
Below that we have the other synthbodies, whom I am going to vaguely lump together. There's uh... Feyri, Faith, Simus, Pancaek, and Auron. Faith's got HALLELUJAH mode, Pancaek's good with amps, Feyri and Auron are walking armories, and Simus is stuck on Heph. They're strong, but M14 shows they're clearly not invincible... and really dangerous when turned the wrong way.
Lukas and Flint are our giant robot overlords, but the former is inactive and the latter actively tries to avoid killing people. He's well armed, but we've seen battlesuit weaknesses.
Xan's a special case and hard to quantify. He's potentially extremely powerful but we haven't seen that power truly brought to bear yet.
Below that, we have the many-mission veterans with good gear and many spent skills. Milno, Lars, and several others fall in this category. All have their strengths, but none are supermen.
Really, I'd say the issue is a bit overblown. The Heph Assault team shows what can be done when the strongest get together, but they're pretty much all never on a mission together now.
(If I missed anyone or you disagree with my assessment of your character's power, then I'm sorry. I'm going by memory plus a quick glance over the wiki.)