There is absolutely a benefit. What is painful is when one venue has a length limit of 6 pages and the next has a limit of 5 pages (plus one page for reference

There is absolutely a benefit. What is painful is when one venue has a length limit of 6 pages and the next has a limit of 5 pages (plus one page for references), but when you port the paper from one Latex template to the other it explodes to 8 pages because of formatting. In all cases, what they want and what you have is "a short paper" but you're going to have to take several hours out of your life and probably make some meaningful changes to the content. What would be best is if publishers could come together and harmonize their requirements to the extent possible.