> I don't want to be to hard on FriCAS since I know this involves 2 variables.

It's not about 2 variables.

    p := product((n-i)/n, i=1..(x-1))
    limit(p, n=%plusInfinity)

That is equvalent to

    p1 := product(1-i*n, i=1..(x-1)) -- eval(p, n = 1/n)
    limit(p1, n=0)

FriCAS can handle that limit.
But due to the defect I mentioned, it can handle limit
from both side of 0, but not from one side of 0:

    limit(p1, n=0, "right") -- gives "failed"

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