There's really not much to manage. It's not in any way a challenge, especially if you ship it as a Docker container.
It's true it's probably not for everyone though; the worker mode will not work with legacy apps that heavily use globals and statics, and works best with frameworks that have infrastructure in place to reset in-memory state on each request. Symfony and Laravel are set up for this, for example. API Platform as well, which the author of FrankenPHP himself authored.
The decreased latency means you can serve more requests with the same hardware, with less of an energy cost. That's a win-win. It's not simply about the user experience.
Also remember that loading a webpage often takes many requests. Every little bit shaved off of one request is multiplied. Add onto this that it supports 103 Early Hints which can tell the client to start loading static assets ahead of time, this dramatically reduces total page load times because it avoids the cascade (i.e. browser needing to wait to read the HTML to know what JS/CSS to load). That definitely has a noticeable effect to users.
It's true it's probably not for everyone though; the worker mode will not work with legacy apps that heavily use globals and statics, and works best with frameworks that have infrastructure in place to reset in-memory state on each request. Symfony and Laravel are set up for this, for example. API Platform as well, which the author of FrankenPHP himself authored.
The decreased latency means you can serve more requests with the same hardware, with less of an energy cost. That's a win-win. It's not simply about the user experience.
Also remember that loading a webpage often takes many requests. Every little bit shaved off of one request is multiplied. Add onto this that it supports 103 Early Hints which can tell the client to start loading static assets ahead of time, this dramatically reduces total page load times because it avoids the cascade (i.e. browser needing to wait to read the HTML to know what JS/CSS to load). That definitely has a noticeable effect to users.