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It's not that simple - Never has been, never will be. Just taking a resistance or two doesn't end many pokemon(Metagross and Jirachi, and the never had a shot Doublade. And frankly, if you knew how to play, you'd know that the number of weaknesses doesn't really matter, but the number of safe entries and the ability to force a switch.
How many pokemon can you name with Fire, Fighting, and Ground moves? 2 of the three? One of the ones worth having?
When it comes down to it, if I were asked to improve a pokemon competitively with just a single type by giving it a second type, 'Steel' would be the answer almost every time for the following types:
Normal Fire Water Grass Electric Ice Ground Flying Fighting Bug Poison Dragon Fairy
Psychic and Ghost pair only slightly better with Dark now that Steel doesn't stop Ghost and Dark. Meanwhile, Dark pairs well with Poison. Rock and Steel is just overly redundant - It's better to have a few answers and suck than no answers, so I'd be willing to crown Rock/Dragon or Rock/Grass or Rock/Flying, but Rock/Steel has an edge. Only slight edges here and there, though. None of these can stop a pokemon dead the way Steel pairings can, they just have the ability to come in and take a shot.
So if that's not broken, that it matches up so well with virtually every type, then I don't know what to tell you. Yes, Fire, fighting, ground moves are all popular, but that's because a team without two or three attackers using those types likely won't get far. And ultimately, an ability has the odds to sway defenses more anyway. It's just so sad that a number of them play more into Steel than any other type.
Steel shouldn't resist Fairy and Psychic. THAT may have been enough. That, and fixing threeish other types, and I wouldn't mind.