Much of what J65nko write is true: both troff and TeX are geared primarily for paper output of whatever size. That can be proposals, reports or books -- that does not really matter -- but they are not at their best for other formats.
That said, how an abstract (for example) appears is controlled through the macros, and those are pretty easy to edit. That part is transparent to the user. You just have to designate it as an abstract.
As an aside, when people ask me what I do for a living, I often say that "I kill trees." Clearly output to paper is what matters to me.
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