... what?
Just listen to yourself. You're basically saying "If you give equal resources to two players, the player who invests willy nilly here and there will be better in EVERYTHING and EVERYWHERE."
Which... is entirely in reverse. When all you have is base stats, your damage output is absolutely miserable. Have you played around in a damage calc and seen just how little you need to increase your damage dealt by using a SR weapon? Swapping a 2200 off-element weapon for a 1000 attack slvl5 SR (that's level ~50 for a 1500 max attack SR and 10 R weapons) is a damage increase. Repeat that a few times, and for a pittance of an investment, your damage output has increased a ton. And oh look, now you're a monogrid user.
For the record, my weapon grids are:
Thunder: 100% + 30%
Fire: 90% + 10%
Water: 77% + 17%
Dark: 62% + 16%
Wind: 50% + 23%
Light: Nope.
What about you? You have what, 32% + 32% ish per element? Just try inputting a 5000 damage base damage higher and play around with Assault% and you'll quickly notice that your advantage isn't... quite... an advantage. At all. The only element where I expect you'd beat me in is Wind. After this raid event is over, my Wind% will explode since I need it for clearing Thunder Accessory Quests. What about you?
How are you going to grow your Wind power? Oh, you're going to gain one Wind weapon in a month, and another in two months?
Well, you'll probably catch up to my Wind team again at that point, about seven weeks later. That's nice.W-What? Why are you assuming that mono users are completely retarded? Why would anyone leave any Hime ever under maximum level? This game throws a ridiculous amount of exp at you during Advents, which you can clear with 4 Hime or even 3 often enough, that leaves you with 2-3 leveling slots. Everyone should have all Hime at max level at all times.
Come on man, don't base your ideals around somebody being stupid.