Not really. Those bad ones look for outside help when people who maintained all that leave and they don't find in-house devs quickly. Projects that use frameworks tend to maintain opinionated structure that frameworks usually push. Which helps onboarding. Not always, but mostly. And it's always easier to fix and maintain the mess I see for example in a Laravel project, than in built-all-alone project.
I'll rephrase: my suspicion is that there's a survivorship bias here. No-framework setups with poor architecture cause people to leave more often, while no-framework setups that work out are a pleasure to work with.
