> You can only test a very, very limited number of designs, out of all the pretty much infinitely many possible ones. Someone still has to come up with the designs to test.
Yet it's still testable. There isn't anything you can't test somehow and there isn't any design any designer could come up with that can't benefit from incremental improvement as a result of testing.
> And it is very unlikely that you can go from one design to a better one in incremental, A/B-tested steps.
That's your own strawman, no one says you have to. Test radically different designs against each other, testing will still declare a winner and that winner can be incrementally improved by further testing.
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> You can only test a very, very limited number of designs, out of all the pretty much infinitely many possible ones. Someone still has to come up with the designs to test.
Yet it's still testable. There isn't anything you can't test somehow and there isn't any design any designer could come up with that can't benefit from incremental improvement as a result of testing.
> And it is very unlikely that you can go from one design to a better one in incremental, A/B-tested steps.
That's your own strawman, no one says you have to. Test radically different designs against each other, testing will still declare a winner and that winner can be incrementally improved by further testing.