Conciseness is often considered a virtue among hackers and software engineers. FOSS maintainers in particular generally prefer to keep bug reports, questions on mailing lists, discussions in IRC channels, and so on, close to the point and with minimal faff. It’s not considered impolite to skip the formalities — quite the opposite. So: keep your faffery to a minimum. A quick “thanks!” at the end of a discussion will generally suffice. And, when someone is being direct with you, don’t interpret it as a slight: simply indulge in the blissful freedom of a discussion absent of faffery.