Can we have a genuine discussion without the goal post moves? This shouldn't be a game of whack-a-mole.
There's nowhere left for the discussion to go. We've distilled the game down to DPR, AC, and save chances when there's more to combat than those three.
I can argue whether or not it's fair for a TWF rogue to have sneak attack or not. We can all agree if they don't, there damage goes out the window. I could argue whether or not it's fair to assume a fighter at any level will have more protective armor than the ones they start with. We can agree if they don't, tanking goes out the window. I can argue most wizards never take a control spell that parallels stunning strike. We can agree if they don't, a monk in a party is much more unique.
And I can make these claims uncontested just as anyone can make uncontested claims about how sneak attacks are guaranteed every turn or that all mundane equipment will be available and affordable by level 2.
Whichever sounds reasonable or gets the most agreements doesn't matter since you can't quantify an appropriate estimation based on the most likely maximum of 10 responders to this 45 page deep discussion. The sample size is too small and their testimony may differ from their actual play.
Honestly, I can play this way:
Let's assume the amount of opportunities to attack that a fighter gets every turn equates to 60% of all their enemies and a fighter's DPR is 45. Now, let's assume the monk's extra movement speed grants them 95% opportunities to make their attack every turn. A monk's DPR is 40. The fighter only has an effective DPR of 27 while the monk has an effective DPR of 38.
It's nonsense based on assumptions that you require the audience to have in order for your predictions to work. Even if you consider yourself being generous, the actual number is no more than the assumption it's based on.
You can start the discussion with: "let's assume the fighter will have GWM and they do this damage..."
I can say "No. I don't think an average fighter will pick up the GWM feat."
You could respond with: "Look how often it comes up in these forums! Everyone I know who plays fighter takes it!"
And I'd say "So? That doesn't mean the average fighter takes GWM, even when the feat's available."
It's the same energy as "The earth is flat! Let's assume the earth is flat, that would explain this! Look around, these are flat plains, not a round curve!"