Two distinct things I feel the need to address here:
1) (more on-topic) Balance as an attribute of the system vs balance as a goal of the DM. The DM has enough to do in any game - he's imagining, statting out, making decisions for, and portraying everyone & everything in the world /except/ the PCs. Also taking on the burden of balancing the PC's against eachother by tailoring every story or encounter or 'day' to showcase each of their disparate talents, failings, and strength so that they take turns shining and sucking in some equal proportion, can only take away from his already substantial responsitibilities.
2) (tangent) The whole my-style-as-serious/your-style-as-pointless thing. No metaphor or terminology is going to make that sort dismissive personal attack a helpful thing. We could talk about the commonalities of different styles and how a game could emphasize what they have in common an minimize hammering on differences to create something that could apeal to both - like 5e supposedly wants to try to do. IMHO, solid overall game balance is key to that, because it gives the players and DMs the tools to create the characters and scenarios they want - whether those are symetric contests of skill and chance, or asymetric challenges of cunning and desperation.
You are entitled to your opinion but as a DM I want the freedom to tailor the game to my players because WOTC does not sit at my table. I do not find it difficult at all to balance the game for my players. I don't find extra work. To me it is part of the whole encounter design. If I run a module and it is full of undead but I know my group has a favored soul not a cleric and they don't have a way to turn undead then I am going to take that into consideration.
I think you are being over sensitive if I say we take the game very seriously we want gritty and a chance to get gangrene and want role playing reasons for the party to do the things it does that is not a cut at people who say I want to kick in the doors kill things take their stuff and I want easy rules that allow me to do this.