Can you give examples of languages(compilers or VMs with bad defaults in your opinion?
If they had instead made the default to act like almost everything else it would have worked with standard process monitors and limits with no effort required and a substantial fraction of the downtime I’ve seen for Java applications would never have happened.
Similarly, if developers who deployed apps knew enough to avoid this, we’d know by now because it wouldn’t happen so frequently. It does highlight who failed to do real health-checks (e.g. years ago most Hadoop services needed huge amounts of RAM to start without crashing but they’d be listed as okay) but it’s the kind of thing sysadmins have been cleaning up for decades.
My opinion of a bad default would include a language toolchain which defaults to dynamic linking and requires one to opt into static linking (Java, Python, JS, etc, etc, etc). Worse than that is an anorexic toolchain that has no defaults whatsoever and requires you to pass every little detail directly to the compiler--bonus points if your language has a massive ecosystem of competing tools which are meant to manage these sorts of details for you but utterly and uniformly fail to do so (looking at you, C/C++).