If ever there was a bikeshed to bikeshed all other bikesheds it’s people creating hierarchies where none is needed. Toml is fine, it’s perfect, it’s exactly what people would expect and remember. But instead you’d have them need to remember that it’s hiding in std. “but if everything’s in std it’s easy to remember!” Yes but then also it’s not needed. And if everything isn’t in std you leave people having to remember if toml was in std, sys, or was it found in tools? Utils? Or did they put it in parsertools? And for what reason? The user knows they want toml. And it’s not like you need to have multiple separate tomls in different places in the hierarchy.

Leaving users having to guess where in the hierarchy you decided to hide something, that they know they’re looking for doesn’t add value. No, just keep it flat and simple.

They reorg'd in 3.0 but fell short of mandating namespace guidelines, so it was inevitable that the chaos would come back in at some point.

Who knows, it could be a good feature to earn the 4.0 moniker.