I think that over time we have got used to the regular posters and make allowances for some, agree with others and ignore still others almost automatically. We know who is the Bully, the Condescending One, the Self-satisfied Moaner, the Irritatingly Off the Point One, the Opinionated One (especially on matters of which she is completely ignorant), the Last-on-the-Band-Wagon One, the Calming One, the Excited One, the Well-informed One, the Well-rounded One, the Humorous One, the Indignant One and so on and so on. New posters can be a bit more challenging and disrupt our complacency.
I don't post that often now but have done so in the past so, no doubt, earned my own less than flattering sobriquet. Please don't tell me what it is. 