The result is that even if you have extremely good hygiene about who you follow: rage bait will still often make it's way onto your skyline as quote dunks, reskeets or replies. So if there's an account you just don't ever want to see blocking is still the most fullproof way, even then you're still often exposed to screenshots of rage bait.

As a corollary if there are accounts that everybody knows are just going to be trolls, mass blocks help starve them of attention before they get a foot hold.