This debate seems to be about defining social norms for your social circle.
PP have talked about someone posting 70 photos a week of their baby, another about someone documenting their daily cleaning schedule and another about daily runs and what they eat.
Those sound like extreme examples and not sure anyone (apart from the poster) would find that appropriate.
Same with the covert or overt bragging.
It’s just poor social skills - people who are unable to “read the room” IRL probably unfiltered and unchecked on SM with less feedback just aren’t aware of how they come across to others.
They may not care what others think - or it may be their online personal diary for their own benefit - or maybe they do care and adapt the posting rate and content if they want to consider their audience.
Def over the years most people’s posting style and frequency has changed / settled …. Others like these examples then stand out - bit like IRL social situations some people have poor social skills, hog the airtime and can’t do dialogue, all bragging and one up manship. These are not new poor social skills - we are just seeing them unchecked on SM.
As others have said - just mute anyone you find boring, irritating etc - same as you would IRL - swerve and avoid these characters.