I think you misunderstood me gmnenad, I was implying that your "system of averages" suggestion would create a game with far less variability, but that wasn't necessarily a reflection on the DoS franchise. As other people have since stated, DoS has a very different combat system than 5e, which is why I brought up the fact that trying to turn the 5e combat system into a DoS style combat system would likely yield a result unfavorable to both fandoms.
And the resources to create this system would be more significant than you might think, as they would need to code for to all the unique spell effects, attack types, class abilities, monster abilities, etc. They would need to decide how each variable translates into the equation in different circumstances, and then test the application of this new system across all the many ways that it would need to be applied. All of that energy could instead be used to create more content for the game, improve the story, add popular class options from DnD books outside the PHB, etc.
I think sometimes when you try to please everyone, you end up pleasing no one, and even if this theoretically could be toggled off, it would impact that final product for all players, whether by detracting from what Larion could have otherwise developed, or by hurting people's impression of the game when they see this version and think it representative of how Larion implemented 5e. The long term health of a game is often better sustained by prioritizing its core aspects, and even if it means the game won't appeal to every person. It would be better for the franchise in the long-term if only 50% of the audience considered the game a 10/10 while the other 50% considered it a 5/10, rather than 100% of the audience giving it 6/10.
