That's the "comprehensive reform" argument weaselly politicians use. Ex. Chuck Schumer works for the banking industry. The banking industry needs reform after financial crisis. Chuck blocks banking reform by demanding "comprehensive reform" and refuses to implement partial measures that would help/start the reform process. He claims he's strongly in favor of reform. So much he's unwilling to compromise for partial measures. As such, he votes against all measures of reform. Sure Chuck, we all believe you really want to reform the banks that paid for your elections.
If end to PSTN can make it more expensive for the NSA to collect, then it's good, even if it isn't foolproof.
If the default config for apache were to generate self signed certificates, you would say, that's useless, because MITM. I would say, that's great, because now NSA is forced to MITM if they want to snoop. It increases the expense for the attacker, making their ability to snoop more limited.