So now you're trying to communicate from your home machine to some random host on the internet (website, VPS, streaming service), and you're configured for MTU 9000, the remote service is also configured for MTU 9000, but some transit provider in the middle is not, and they've disabled ICMP for $reasons.
Transit providers should push packets and generally do. With PMTU failures it's usually clueless network admins on firewalls nearer endpoints. And no, you don't and I wish the admin responsible could feel your pain.
Now if you can make it 'will always just push packets', we'll be golden.
Unfortunately, there are enough ATM/MPLS/SONET/etc networks being run by people who no longer understand what they're doing, that we're never going to get there.
To make matters more entertaining, IPv6 depends on icmp6 even more.
