Sorry if you don't like MobileFrontend's design, but it's clearly not an opinion universally shared among readers and editors on the mobile version of Wikimedia projects. It's nearing 20% of our overall traffic every
month,
and growing like weeds.[1] Thousands of people a month are editing via mobile too. Neither of those things would be happening if your logic was correct, and their divergent choices from the rest of MediaWiki were
really
so awful for users. The way MobileFrontend is designed is highly effective for people on mobile devices, and I think there's no reason to block an experiment to let people opt-in to its style of typography on desktop.
MZ primarily said the design choices of mobile differ significantly from mediawiki core, and hence don't really represent a precedent in core. This is a statement I agree with. Whether or not these choices are good ones is debatable and probably the grounds for a flamewar. However I think that's besides the point for this conversation.
-bawolff