You might be a photographer, but you sure suck at understanding the technology behind photography. In fact, you're so wrong that I registered an account just to tell you this
Contrary to what you posted earlier, optical image stabilization is useful for all focal lengths, but especially useful for telephoto focal lengths as that's where OIS is needed more, both for stabilizing the viewfinder (not an issue in cellphones, but a huge issue in DSLRs, binoculars, telescopes, etc.), as well as reducing the minimum shutter speed necessary for a blur free image. The there's a direct relationship between minimum shutter speed and focal length; the longer the focal length the shorter the shutter, hence the greater need for OIS in telephoto lenses vs wide angle lenses.
In fact, when Canon created IS back in 1995, the first lens they used it in was a 75-300mm telephoto zoom. Afterwards, they integrated it into their telephoto prime and zoom lineup before putting it in normal or wideangle focal lengths. The 70-200mm f/2.8 telephoto zoom is the 'base' lens for Canon's IS system, they usually innovate and develop new generation IS systems in that lens first, before it spreads to the rest of their lens lineup.
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I can assure you that OIS in 'long lenses' is most certainly
not considered a marketing gimmick by most photographers. I don't know your level of experience, but the OIS in my 400mm f/2.8 most certainly does something (up to 4 stops!), and it's something I, along with almost every other amateur and professional photographer out there, relies on, on a daily basis.
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Ever tried to use a tripod (or monopod) on a boat, helicopter or other moving surface? Yes, tripods are great, but it doesn't solve the problem all the time. Once again which is why OIS (and bumping up the ISO as M. Gustave mentioned) is so valuable.