Finally someone says it! Believe me there are so many so called "TA experts" whereas everybody with some (academic) background knows that TA is BS. One reason is the time the market has been around and a second reason is that the past is a bad indicator to correctly predict the future. I mentioned two years because it sounds to be a reasonable time horizon to have a fair chance to not find yourself in the middle of an ongoing crash at least at some point in time. But, and this is a big but, you never know. Can be the same problem in two years as it might be in six months.
I wouldn't go so far as to call it bs, what's BS is that you can swear by it and use it as a completely reliable tool -- it helps and it confirms, and it identifies possible opportunities, but I think the TA I enjoy the most is by those who know what the real deal is with it. Helpful, informative, and entertaining (I admit, I do indulge every now and then cause it's fun to fantasise haha).
I do point out the market's still far too young to build proper TA too -- 2013/14 if you want to be lenient, is still 2 years away from completing a decade's worth of data.