Yes, these are called contingencies. And TA does noet account for them. There is also some thruth to what you said about TA working better for top 25 coins. This is likely due to higher trading volumes. Technical analysis works because people consistently repeat behaviours under similar circumstances. But there have to be enough people to repeat behaviours to form patternd to begin wiht. That might be harder (even less reliable) with very low volume, low cap coins.