I'd say that ICMP is only situationally blocked by firewalls, not the other way around.

Because I can ping almost any public server on the internet and they will reply. I can ping your website just fine and it replies to me!

That kind of cargo culted tradition is how you end up with weird packet loss and VPNs that flat-out refuse to work.

I could be convinced to block inbound pings. Anything past that and I'd want solid evidence that it wouldn't break anything, with the expectation that it would.