Use the right tool for the right job. I always use plain PHP for all those things I want to keep running forever without having to spend time and brain space to maintain. You can't beat putting a file on a LAMP server and forget it's running. I have tons of public endpoint that do all sort of stuff , aren't core to my business and don't want to deal with the operation hassle that would come to keep such framework working and running in the long run.
Just a few examples of such PHP script:
1. an endpoint that is being called by my CI to send messages on IRC and telegram when a new build is ready
2. the analytics bit of my project so I know who does what without relying on google analytics but by storing all that stuff in a mysql db. It's under 25 lines of PHP code and has worked a lot better for me than any analytics tools I've tried: https://gist.githubusercontent.com/mickael-kerjean/289d3d0be...
3. the target of the contact me form of my project
4. all the webhooks and other simple marketing automation stuff I need to process one way or another
5. all sort of online tools relevant to my niche to boost the SEO side of my OSS project
6. my status page which is an array of url I look after that is being curl around
7. crud cloud instance of my OSS project
and many many more examples, got about a hundred random stuff running from a single cheapo VPS I don't have to maintain.