Not being familiar with this area the page didn't help me understand the use case. This explanation of firecracker makes some sense though: "firecracker is purposefully minimal to present less possibility for configuration mishaps and importantly minimal attack surface (it's usually used to run untrusted workloads). Also full control by ReST-API makes it easy to orchestrate."
https://stackoverflow.com/questions/74512158/what-makes-the-...