Because I'm looking at just the base damage. As I mentioned in my OP. Action Surge gives ONE extra action (set of attacks) pwer short rest. Superiority dice are 4 per short rest. And I didn't account for Smites either.
Actually, I do account for OAs - they're covered under Reaction.
Try looking at 11th level+ You know, when Fighters get their third attack, when Paladins get bonus damage, and so on.
The sheet you uploaded has no reaction section...
Clearly the fighter is better at level 11+. Why would I look at something obvious?
I think this is missing the point that people are making when they talk about overkill damage. Obviously overkill damage is never a bad thing, but if comparing the damage output of two builds with similar averages but different variances, the lower variance build is preferable every time.
One reason being that if you are achieving your average by combining a lot of misses with a lot of overkill damage, your average is overstated compared to the character that hits reliably and does near average damage most of the time.
The flexibility of the fighter's damage is a big part of their value: they can attack the same target multiple times, or kill several mooks in a turn, and, as you note, use action surge when it is most tactically advantageous. It makes them better than the rogue or the paladin at effective killing, even if their average DPR numbers might be the same.
It also means, by the way, that -5/+10 builds aren't quite as good as the average suggests.
It's subsumed. You'll note that the spreadsheet has no Bonus Action section either. Just put in the total number of attacks the fighter gets, from 3 (for a 11th level fighter with no Reaction or Bonus attack) to 6 (for a 20th level fighter making both a Reaction attack and a Bonus Attack), in cell B2.
Because if you got off your high horse and examined the issue, you would find that that is not the case.
It's subsumed. You'll note that the spreadsheet has no Bonus Action section either. Just put in the total number of attacks the fighter gets, from 3 (for a 11th level fighter with no Reaction or Bonus attack) to 6 (for a 20th level fighter making both a Reaction attack and a Bonus Attack), in cell B2.
I posted the freaking numbers for a level 10 fighter and level 10 ranger.
Because I'm looking at just the base damage. As I mentioned in my OP. Action Surge gives ONE extra action (set of attacks) pwer short rest. Superiority dice are 4 per short rest. And I didn't account for Smites either.
That's not really true though. About the only time overkill grants the PC that does less any sort of advantage or parity is if both pcs are killing an enemy in exactly 1 hit, maybe 2 hits. That's rare in practice. At level enemies hp goes up absurdly fast. It's rare to keep on fighting orcs and goblins.
At the end of the day, the higher DPR PC will still nearly always kill the enemy faster than the lower DPR PC.
It makes them better at killing multiple small enemies. Against the bigger enemies with sufficient hp then the paladin actually performs better as he has the resources to ensure it dies on the 2nd turn whereas the fighter doesnt'.
Actually they are better than the average suggests. They can 100% kill more different enemies in a single attack than their non -5/+10 counterparts.
For example a 15 hp enemy pretty much always dies by them in a single attack. The same 15 hp enemy takes 2-3 attacks from a non-5/+10 PC to kill. (Thinking of a longbow wielding bow user).

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.