I'm trying to figure out the differences between Form Layout and Section Layout. Mainly, is there any reason to use a Form Layout over a Section Layout? I've been using Section Layout because I seem to be able to do everything I need with it. I understand the notion of "well, if it works for what you need, then use it". I also understand that we have the ability to nest Section Layouts (which is one main reason why I use them), but not Form Layout. However, I still continue to wonder what the actual purpose of Form Layout is for. If there is a downside to using Section Layout in lieu of Form Layout.
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Nominally, Form Layout is intended specifically to be a top-level container for Task Forms. It contains a header label that's different from the section layout header, and its own buttons section which will always be bottom-oriented, and has its own form-level validations spot (though that's easy to replicate in an individual section as well). The FormLayout may contain any number of nested sections (and/or other elements).
Really these days it's optional, though I always use it for tasks to maintain a consistent Button style at the very least, as well as to get the top-level form header.
Generally agree with Mike - in most cases they are the same. The two things that Form Layouts do that I'm pretty sure other components don't do are:
I can't think of anything else that couldn't be replicated in some other way using a section layout (or other components).