Correct, there is "objective TA" and such does not imply the trader using such will be profitable. There's also "subjective TA" and such does not imply the trader using such will be profitable. The determining factor about someone's profitability that's using TA is how that TA is integrated into one's trading plan (e.g. market context, money management, trade management, position size management, capitalization, discipline and other components of the plan). Yeah, putting the puzzle together is not easy. Yet, the misconception given is that some of these traders with a complete trading plan that took them tons of time & energy developing... They will then tell other traders (including newbies) that trading is easy when in fact the route to easy trading was very difficult.
Imo "objective or psychological" is not the issue. At the end you will never know whether the decision was due to skill or due to emotions. There is good TA and bad TA. Most traders do bad TA because it is easy. Good TA is hard. It is the same in almost all professions. It is hard to be a good doctor or a good football player. Most wannabes are bad. Those who work hard get good because they understand the bad part from the good one.