> SIAM (applied math) does not for instance.

What? I have papers there and they insisted on latex.

https://www.siam.org/publications/journals/siam-journal-on-m...

> Authors of accepted papers must submit TeX files to SIAM for typesetting. Authors are highly encouraged to prepare their papers using SIAM's standard LaTeX 2e macros. Note that the SIAM office will format Plain TeX and AMSTeX files to LaTeX 2e. The LaTeX 2e macro package and documentation are available here or by email request.

That’s weird. I always upload PDF. And the copy editing is done on their side by editing the PDF using some fancy Adobe pro tool. I never uploaded a *.tex to SIAM. Of course I use latex to prepare the PDF.

> Some journals accept Tex files? I’m surprised. SIAM (applied math) does not for instance.

Each journal I've checked on their site (admittedly, only 4 or 5) seems to mandate TeX.

E.g. https://www.siam.org/publications/journals/siam-journal-on-a...

> Authors of accepted papers must submit TeX files to SIAM for typesetting. Authors are highly encouraged to prepare their papers using SIAM's multimedia LaTeX 2e macros. Note that the SIAM office will format Plain TeX and AMSTeX files to LaTeX 2e. The LaTeX 2e macro package and documentation are available here or by email request.

They definitively don’t mandate it. I got 4 papers there, all uploaded in PDF directly.