Why would SE design only around 1 piece of content? Furthermore the content the least amount of players participate in. You're basically saying its ok for BRD and DNC to suck in solo content, group content, content with adds, pretty much ALL CONTENT that isn't savage. And hey they suck in savage too unless the rest of your party are all great players. Yeah makes perfect sense, MCH should be better in everything all the time. Besides MCH, DNC and BRD can all clear savage as is with plenty of time to spare on enrage so DPS isn't an issue for clearing content.
Normal Raids are not optimized, yes probably true. BRD and DNC need every thing they do to be optimized or they suck, that's how buffs work. I certainly don't get optimized groups in everything I do. MCH doesn't need this, they just worry about their own performance which is why they are ahead in everything outside the most optimized groups. But hey even Savage among 90% of all savage players MCH does better. Only when you reach the top 10% does BRD and DNC surpass MCH. It takes a whole party of perfect execution in a perfect scenario with perfect buff windows for DNC and BRD to pull ahead. MCH again doesn't need anything special, you don't rely on 7 other people executing perfectly to perform well.
Imagine starting a new class and being told. So you can play DNC or BRD but keep in mind you will be the worst DPS in all content until you hit savage and find a group of 7 other amazing players who never make mistakes and once you do you'll shoot 1-3% higher than MCH to become the 2nd or 3rd worst class. Or you can play MCH do great dmg in all of the games content including savage until you reach the highest level possible at which point you might drop 1-3%. You guys may not care about 99% of the games content but the majority of players do.
I really wish we could have had a discussion about fixing the range role and making MCH, DNC and BRD desired but its clear all MCH players want to do is be the best phys-ranged option for all scenarios making BRD and DNC pointless.