So you start with PHP, and you keep adding hacks on top of hacks, until you realise it's hopeless. But you're too invested, so you create a new language that is kind of compatible, and a JIT for good measure. Of course, I hope you got really successful, because you'll need serious engineering talent and money.

No language/tech stack is going to ensure success, or have no challenges. But learning from the past is not a weakness.