It's easy to handwave about how costly / difficult a thing is when you're ignorant, and you're preaching to others who are also ignorant about the subject matter, but people who actually understand programming can read the bug reports, the read about debugging methods and results, about the tests, et cetera, and can deduce when an action really can't be anything but monumental ignorance or, more likely, deliberately chosen. The ignorance of the apologists isn't equal to the actual experience of the people doing the work.
"triggering script hang/out-of-memory issues through what seems to be deliberate behaviour when the script does not pass a collection of Web API checks (since the same behaviour was observed on their "officially supported browsers" as well if the user-agent was spoofed to Pale Moon!)"
I'd love to see how those people try to spin this.
Also, this is a perfect example of how large companies can both try to create the illusion of being open - several high profile Cloudflare people post on this site regularly - yet there's no way to actually communicate with a human who can do more than copy and paste from a script, unless you're a paying customer. No company should get to operate as a gatekeeper for much of the world yet have zero methods of communication unless you pay them.