> Outside of disciplines that use LaTeX, the ability of authors to do typesetting is pretty limited.

Since this is obviously true, and yet since most journals (with some exceptions) demand you follow tedious formatting requirements or highly restrictive templates, this suggests, in fact, that journals are outsourcing the vast majority of their typesetting and formatting to submitters, and doing only the bare minimum themselves.

Most of the tedious formatting requirements do not match what the final typeset article looks like. The requirements are instead theoretically to benefit peer reviewers, e.g., by having double-spaced lines so they can write their comments on the paper copy that was mailed to them back when the submission guidelines were written in the 1950s.

The smarter journals have started accepting submissions in any format on the first round, and then only require enough formatting for the typesetters to do their job.