@4108
"what happens when an imperfect player evaluates a position?"
++ Neither the player nor the engine evaluates the position,
the 7-men endgame table base evaluates the position and it is perfect.
You appear entirely delusional here. The large majority of the positions in those games have more than 8 pieces on the board. You claim "perfect" analysis of those positions. This includes (hilariously), the claim that every single opening played is known to be perfect.
These positions CANNOT BE FULLY ANALYSED to a tablebase. Doing the much simpler task for checkers required a great deal of computation. Doing this task for chess cannot be done at present.
"This happens in every decisive game." ++ Yes, every decisive game has some error.
These are decisive games played against the engines you are relying on for 100% reliable evaluations.
"All available sources of opinions are imperfect and can be completely wrong."
++ Yes that is true, but some absolute statements are sure not to be wrong.
That is as useful as the trading advice that some currencies are sure to go up. The question is which ones.
Certain endgames with opposite colored bishops are drawn.
True, but not relevant.
1 a4 cannot be a better move than 1 e4 or 1 d4
Your blunder (which I am qualified to point out) is in the jump from good bet to certainty.
Your reasoning is exactly the same as buying a lottery ticket and saying "I am certain this ticket will not win".
You are right to be confident. You are wrong to be certain.
1 e4 e5 2 Ba6 loses for white
A more extreme example of the same.
"It's a good bet that on an individual position, a very strong player is correct in their evaluation."
++ I even calculated that probability.
No, you did not. You estimated it from a sample. An estimate from a sample is NEVER 100% reliable. That is a statistical fact.
If you let the 10^9 nodes/s cloud engine run for 17 s, or a desktop for 4.7 hours, then the absolutely correct move will be among the top 4 engine moves in all but 1 case in 10^20.
I am not 100% sure if this is a wrong estimate or an uncertain estimate, but it is certainly not a hard fact.

this forum is going till 5k posts which consists nothing but trash
I bet it doesn't stop then.