I am in the final stage of formatting my thesis and still have to tweak the page layout in several places. LaTeX does generally a good job but some pages come out unsatisfactorily, with widows/orphans, footnotes that continue on the next page, sections that start at the bottom of a page etc. I allow all these in general, but sometimes I would prefer to adjust the text with rewording or with \looseness to get a smoother output. Is there an overview that lists some of the possible manual methods in this last stage of polishing?
I have a specific question that concerns the gap/distance/separation between the text body and the footnotes area. I defined this with \setlength{\skip\footins}{1cm} but I would be open for this length to be flexible in cases where a bad layout could be easily prevented. I looked in vain for ways to set it flexible. Is this because it would be bad typographic practice? If yes, why?
I work with \raggedbottom, which may be relevant.
See also Automatically make footnote-carrying pages vertically stretchable and a related discussion in German: https://komascript.de/node/1239
Am I actually just looking for a stretchable length like 1cm plus 0.5cm? Does LaTeX then choose a length for the best-looking option?

footmiscpackage with the optionbottom? From section 1.8 of the package's user guide: "[Thebottom] option forces footnotes to the bottom of the page; this is only noticeably useful in case that\raggedbottomis in effect, when LATEX would normally set the footnotes a mere\skip\footinsdistant from the bottom of the text." – Mico Oct 15 '21 at 11:31\raggedbottom. But loading\usepackage[bottom]{footmisc}does not change my output. – johnny7 Oct 15 '21 at 11:56