1) ID checks will not close the trade off. Real IDs are easily available on the market. Thus criminals will used them no problem. It's the law-abiding privacy-minded people (like me) who would be hurt the most.

2) Your point is valid. I too want to know whether I am engaging with a bot or a person. This is impossible now and it will be impossible once ID check becomes ubiquitous.

3) I will be happy to see (or not) a blue checkmark by the profile name. Just like in Twitter. That's enough.