For the record, I think the vast majority of people&#x27;s arguments about HFT are simply about the definitions of what HFT is.  It isn&#x27;t clearly defined anywhere and the blog post you linked earlier certainly doesn&#x27;t capture any definition I&#x27;ve seen used in the industry.<p>In my experience though, electronic market making, which I regard as a very good thing, is a direct subset of HFT.  To do it properly you must be fully automated, fast, across venue and trade alot.  By nearly every definition I&#x27;ve seen that makes you HFT.