Sam2: Hataras nedarim of erev rosh hashana definitely has halachic value for all nedarim which one has no recollection of; however, nedarim which one does remember must be specified in the nussach in order to become nullified. A hanhaga tova which was repeated three times does need to be nullified midrabanan; however, I can’t understand how refraining from doing something (as opposed to a positive action) can constitute a neder.
Yitayningwut: Great to hear from you as well. I remember having stimulating debates with you in the past. Shame I can’t get to meet/know you IRL. I hope I’ll disappear from here quickly, as this place is addictive and minimizes my capacity for fulfilling my responsibilities IRL.