Philostrate urges Theseus not to watch "Pyramus and Thisbe", deeming it unworthy of the Duke and his new wife. Why does Theseus disagree with Philostrate? Act 5

Theseus says nothing can be bad when it is created by simple people that try hard.

I will hear that play. For never anything can be amiss When simpleness and duty tender it. Go, bring them in.—And take your places, ladies.