I agree that trading based on TA can increase significantly return on investment. For instance, if I did follow my simple gut-filling in last 18 months my overall return will be at lest 3X bigger. I did not! :(
Also, I did not found anyone who can point in advance (one to two weeks, months or two) where to take profit and where to re-enter. Everyone is General after battle, but we are all Solders during.
PS: Bio-sector is big enigma even to the best sector analysts, while TA (more than simple point or two) is average from blind investors, imo. Typical latest example is ALXN and PRCS.