I've seen action surge get into the 200+ damage range. Think you can double that in 2024.
Care to lay on me how, exactly?
Because even if you're getting wall to wall crits on 3xEA
and using the -5 attack/+10 damage feat that applies
and wielding a high-die weapon that's also +3 and adds extra dice, I'm not convinced.
That is, the static damage there would be: 3 (magic weapon) + 5 (ability mod) + 10 (GWF) = +18. Six attacks gets you 6x18=108 damage. Six consecutive crits (which, I will note, even a 15th level Champion Fighter is
very unlikely to see: that's less than one in every 87
thousand Action Surge rounds), assuming a +1d6 magic weapon of some kind, you're still looking at 6x6x3.5 = 128. Meaning it only made it across the finish line
because I made the extremely unlikely interpretation that every attack was not just a success but a crit. (Admittedly, if you get a really fancy weapon that does +2d6 bonus damage, then it's a bit more feasible.)
So unless you're talking about someone who was already buffed to hell and back...
by spellcasters!...or wearing fancy magic equipment...
that was created by spellcasters!...I'm really not sure how you're getting these numbers.
And even then, I had to presume a 15th+ level Fighter
and magic items, something folks on ENWorld and elsewhere are all too eager to completely strip away from the party. "You never need them!" Which implies the DM is manipulating things to favor martial characters. Oh, and would you look at that...
The DM is actively putting her thumb on the scale to favor martial characters over caster characters
I already mentioned this.