>It would be interesting to understand the ratio of real human posts to manipulation on twitter for example - I’d imagine it has long ago tipped to majority bot.

The vast majority of bots are government funded. Banning anonymity will just mean people only see bots funded by their own government and its allies, making it even more one-sided (because their own government will almost certainly still have the ability to make bots, like in Chinese internet).

Excluding foreign influence is still a huge win.

Having external actors take control of your democracy is the nightmare scenario - which Ancient Greeks had first hand experience of.