What's the use of not relaying non-standard transactions if anyone can still use them using P2SH?

What's the use of not relaying non-standard transactions if anyone can still use them using P2SH?

It seems that non-standard transactions are not normally relayed because there is a concern this might break the network or it might make future upgrades harder.

But anyone can use these non-standard transactions (and get them relayed!) using P2SH. So what good is this restriction on non-P2SH scripts?

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