There’s been an emphasis in slog on Handler composition over directly implementing a ton of features. Personally I love it - there are things I’ve needed, that slog can do, that few other loggers make easy/possible.
Zerolog will still be relevant for raw performance (slog is close to zap on perf - doesn’t win benchmarks, doesn’t look out of place either), fewer really need it but some really do.
I've been using it for a few weeks now. Overall pretty happy with it. Has good default API, and can be basically arbitrarily extended as needed. We even have a custom handler implementation that allows us to assert on specific logs being emitted in our stress/fuzz testing.
Zerolog will still be relevant for raw performance (slog is close to zap on perf - doesn’t win benchmarks, doesn’t look out of place either), fewer really need it but some really do.