Yes. If your shop is serious about security, it is in no way unreasonable to be building out tools like that in-house, or else paying a real vendor with real security practices for their product. If you're an independent developer, the entirety of Posthog is overkill, and you can instead write the specific features you need yourself.

We had created a sort of Posthog, but for product security analytics (1), and after 4 years of development I can confirm it's not something that you can easily create in-house.

1. https://github.com/tirrenotechnologies/tirreno