it is, but before this new update, topics could be "dead" for ages and still wouldn't close, few days ago devs made it so topics close after a month of being inactive, the best way to know should you answer is last comment, if it was days ago its perfectly okay, but if it was few years ago you shouldn't.
If you want to comment on specific thing, go on search bar next to your little icon and type in what you want, topics with said theme/comments will appear <3