the troll has a point that external accountability fades, the audience thins and stops caring. so the honest use of a public journal is as training wheels: it can build the logging-everything habit while the novelty lasts, but the goal is to internalise the discipline so it survives after nobody is watching. if going public helps you build the habit, use it, just dont become dependent on the spectators, because they will leave and the discipline has to remain.
not crazy at all, its often exactly right, but confirm the sample is big enough first. one profitable setup over three months could still be a lucky run if its only a handful of trades. if its dozens of trades across different conditions and consistently positive, then yes, concentrating on your one proven edge and cutting the rest is what professionals do. just make sure its real edge, not a short hot streak, before you bet everything on it.