The general style of SE is low on formalities. For example, your "Thanks." at the end of the post could well be edited away by somebody as being 'pointless clutter.' In that sense there is no reason to be overly formal.
That said, it is not very clear to me what you mean specifically. I'd say it likely depends on the nature of the comment.
I doubt that you will get a better response to:
Elaborate on point A.
I would appreciate it if you would elaborate on point A.
In some other cases, there might be a difference. For example, I would not write "I would appreciate it if you do not re-post a question shortly after it was put on hold." As this is not just my personal preference and desire but a rule of the site, and I think it makes sense to be more direct in the comment making this clear. One can still try to do this in a somewhat polite way, maybe like: "Please note that re-posting questions shortly after they were put on hold is frowned upon in this community and avoid this in the future."