I think this is a glass-half-full view o TOML, when TOML itself was the one that added water to the glass to begin with.

The main value proposition of TOML is to provide a concrete specification of a INI-type config language. INI is ubiquitous, but it lacked a spec, which led to a lot of wheels being reinvented. TOML fixed that.

If a project needs convoluted config files, I'd argue the project is already broken. If TOML doesn't fit your needs, that's hardly TOML's fault.