Most formatting work is repetitive, rule-bound, and done late — which is exactly when it is most expensive. The method below moves that work to the start, where the rules are cheap to apply.
Formatting is only meaningful relative to a destination. You name the journal or conference you are writing for, and the structural rules for that venue become the rules of your document.
Changing target later re-applies the new structure rather than forcing a manual rewrite.
Sections, headings, figures, tables and references are handled as parts of a document model rather than as text you style by hand. You write; the layout is a consequence of the target.
The modular interface means the pieces you do not need stay out of the way.
Structural problems surface while there is still time to fix them: missing required sections, reference style mismatches, display items that exceed the venue’s conventions.
Validation is about structure and compliance. It does not assess your science.
The manuscript leaves in the shape the venue expects, so the version you upload is the version their system is built to receive.
Retarget and re-export when a manuscript moves to a different journal.
The structural conventions differ meaningfully between publishers. The specifications reference sets out what those differences actually are.