TypeDrawers has endured many discussions about reactions. Moderators of the past had good reasons for settling on a simplified set of reactions (currently: Flag/Insightful/Disagree/Agree), but given that there are far fewer active moderators today, TypeDrawers needs some more assistance from the community when rules are broken.
Being off topic is one minor — but more common — violation that doesn’t warrant a Flag: Breaking the Rules, which is a fairly drastic and nonspecific alarm that draws undue attention. But a specific Off Topic warning from multiple folks could serve as a gentle reminder without having to post a message about the violation, further dragging the discussion off topic.
I suggest bringing back the Off Topic reaction, and hiding posts that get such a reaction from 3 different members. When a member reaches a certain total of Off Topic posts, they are warned and subject to future suspension, just like breaking any of the more serious rules