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FP Or Die Gang is downvoting you, but this is actually correct.

No referential transparency (among other things, no doubt) makes this a harder problem to solve than just using a language that supports it.

$0.02

If you don't have referential transparency mathematical equations don't hold. You can't be sure that `a = b` stays true if deducted once.

So "the problem" doesn't get only harder, it becomes impossible to solve in a formal way.

Thank you for this. That's exactly what I was getting at; you illustrated it far better.