> Waiting for someone to write a love letter to the infamous Windows INI file format...

Honestly, it’s fine. TOML is better if you can use it, but otherwise for simple applications, it’s fine. PgBouncer still uses INI, though that in particular makes me twitch a bit, due to discovering that if it fails to parse its config, it logs the failed line (reasonable), which can include passwords if it’s a DSN string.