I simply stated they will always be at a disadvantage to a geared bike, whether you look at acceleration, top speed, cruising, handling, etc... Gear ratios are very simple things, if used correctly they give you a noticeable leg up on anything with one gear. I loved riding fixed gear, the reason I stopped is because I broke my knee.
Go back and look at who I responded to, and what I actually said. There's no way anyone could take issue with it unless blinded by fixed gear fan boy sight.
IMO the maintenance issue with fg is the biggest plus. The drawbacks are often minor, but that doesn't mean they don't exist.
Just please don't spread lies about being limited to one gear somehow making your acceleration faster, its completely false, and luckily easily seem that way by anyone with a modicum of objectivity.
At the end of the day, my thought is to ride whatever makes you happy. Which is why I still have a junky single speed that puts a smile on my face, in addition to my road bike and old hybrid junker.