making technical analysis is not that hard mate if you have so much time to invest in it to study the graph or let say market. and to be honest through youtube you can easily get some information how it really works..
Well, maybe not that hard as you implied because the real trading transcends knowing TA and into practical reality of first hand trading in real life. This is why a lot of traders aren't profitable despite knowing how to draw the TA lines and all that. Trading is an emotional thing. Any trader who wants to be profitable must have a solid grip on their emotions (fear and excitement) armed with knowledge of TA. Otherwise, they will just be gambling instead of trading.
but also due to the great manipulation that exists in this cryptocurrency market, not all altcoins will be able to make a profit by doing technical analysis
Market manipulation isn't exclusive to cryptos alone. All markets have their fair share of it, be it Forex Trading, Binary or even stocks; they all have it. Come to think of it, it's better to be armed with something going to war than nothing at all. TA is still important even in the face of perceived manipulation.