It is a simple layer 7 proxy and nothing more. It is the simplest so it works. As a comparison, almost all other reverse proxies can handle layer 4 traffic.
and I don’t miss the label feature of traefik at all. centralized config for an entrance gateway is so much easier to maintain and find security flaws. I think labeling would be useful only in production clusters with thousands of microservices that you absolutely need the reverse of control to get away from dependency hell. Otherwise, I advice against using such feature, not even with a caddy plugin. (I mean if you really need it, why not just use traefik…)
From my point of view, most things related to software config is hierachical, meaning that a tree like structure is the most intuitive in understanding them. YAML is tree based, while TOML is section based. I find YAML much easier to keep track of. And I have great experience with Python, so the indentation is pretty straight forward for me.
But I’m not picking sides and defying the other. It’s purely personal mind set related. Actually I do find some workflow very suited for TOML, like build systems, where each task is in its own section, shouting clear cut domain and dependency boundaries.