Why are multiple engines different?

Gig 601XL Builder writes:

One reason is that MSFS doesn't use a physics model it uses tables to
simulate what will happen with a given set of control settings and
conditions. If the conditions at a particular time in the game are not in
the table it uses the nearest set.

With the advent of some really good physics models IN GAMES that are out
there it really surprises me that MSFS hasn't implimented one yet.

If the current model produces the correct results, there's no reason
to change. Which results are wrong?

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