Yeah it's highly available until it isn't and then that turns into your problem rather than something like Gmail just working

that's the thing it cannot stop working because webworker and email forwarding is very reliable, email itself has retries built it and soft bounce handling.

Just a heads up I have seen complaints about CF email forwarding completely dropping emails that failed to pass certain SPF validation. They get completely dropped and the worker doesn't get called and they don't get forwarded, rather than in something like Gmail it would end up in spam