I think most of us are like that. It is impossible to make a comment to everyone's FO's--sometimes I know I'm a bit rushed. I do look at them all, though.
Don't let it stop you from posting your's, though! We want to see everyone's things. I doubt anyone keeps track of who left a comment, so I don't think you'll get any bad feelings if you want to show off your stuff, too.
I think the main reason it was changed was because sometimes a person would proudly post their FO but other people would post right after them and things would get lost.