I have recently observed no matter how good your TA is, it doesn't always work on alt cos most alt price direction is impacted by BTC price.
When BTC is up all other coin move up. So why spending time on doing technical analysis on alts when doing it on BTC gives you a potential clue of most assets price direction?
Bitcoin movement doesn't affect every altcoins every time therefore analyzing altcoins is important. How can be a trader when you don't do your technical analysis then how are you trading or you're just entering the market and hoping for the best thing to happen and move the market in your direction. Some altcoins move separately from how Bitcoin is moving, other times altcoins move with a big pump in price but Bitcoin is still trading sideways.
Technical analysis tells you how a coins is going to movement, if all things stays the same it'll move in that same direction but if other factors comes into effect the movement will be different. You can tell if an altcoin is about to pump or dump from technically analysing the coin but the results aren't always guaranteed since the market sentiment still has an important role it plays on a coin pumping or dumping.