Halt on Hahaha?
As a reader, for me, written laughter can be the cinnamon spice sprinkled on top of a well-crafted story. If a story isn't particularly well written, well, no amount of liberally typed laughter will save it.<p>
And I would say it should be used sparingly and judiciously. The only proliific author I can think of who gets away with not only breaking, but downright flouting that rule is Libtick, who seems to shape written laughter the way a sculptor does wet clay. <p>
Now, as a writer, I sometimes compose for the ear, certainly with dialogue. So, I think it's natural, then, to at least try and convey laughter somehow. Ideally, I do it with a modicum of verisimilitude. <p>
In other words, a line or two of "Hahahanonononottherenotthereekheeheeheehee!" never hoit anybody! 😉