It depends on the author.. you have to keep an eye on the type of author you are dealing with. I, for one, always reply to all of the people who make a comment.. i reward all of those who make a genuine effort to engage with me. i even flag them when they post spam comments. There has hardly been any comment that i have missed out. But if you are posting a comment on a whale’s post who has already received 250+ comments, i realize that it will be hard for them to respond to all of the comments..

The post was written from blogger’s point of view and not from followers’ point of view. Besides, none of it matters if the author is an introvert and doesnt want to engage with people at all.. then she/he shouldn’t complain about their followers not coming to their blogs..
thank you for the appreciation