Is the “obligate herbivory” feeding preference losing meta relevance?

A YouTube guide explaining how the feeding preference system for builds is a spectrum rather than a hard-and-fast rule (from CasualGeographic) claimed that most true herbivore builds rely on the “facultative herbivory” preference. One of the few examples of the “obligate herbivory” preference given in the video are sloths.

Is mandatory herbivory on the way out, meta-wise? (Given how city biomes seem to reward opportunism and smarts, I guess it would make sense)