Hello. There is interested discussion:
https://es4.stackideas.com/stream/item/46 and I agree with it.

I didn’t expected that in es4 will be nested comments, but hoped there will be “Reply” button for each button.

Tag the moment there is no “Reply” button for each button. So to post “sub comment”, users have to Reply to “master comment”. It’s not easy to understand and make user to delete @username.

Can you please add “Reply” button for all comment. May be let’s it work like replying master-comment, but display sub-comment author?

Thanks.