[nitrogen]

The web, as originally envisioned, was supposed to be user agent agnostic. The user agent (AKA browser, search engine, personal AI, braille terminal, screen reader, etc.) would interpret the page and process or display it appropriately for the agent's purpose and medium. Thus, sites shouldn't have to adapt to mobile; it should be possible to write one semantic site that looks right on any device, because the user agent is supposed to do the formatting.

Removing that ability from user agents is counter to users needs and the basic design of the web.