Plausible was not built to be a clone or a full on feature by feature replacement. It is an alternative that works for many people who think GA is complicated, slow, privacy intrusive and so on.

We do try to add what we believe are 20% of GA features that 80% of GA users need without adding too much complexity.

We already do support event / goal tracking and we have metadata for goals as the next big feature on our public roadmap: https://github.com/plausible/analytics/projects/1