Lilmod ulelamaid, to address some of your questions:
Aside from which device a moderator is using, it is also more time consuming to edit than to simply delete or approve. Sometimes we have time to edit/comment, but sometimes we don’t.
Everything is read before being approved.
Sometimes posts are too long to read and are simply skipped due to lack of time. When this happens, a moderator may decide to moderate using a screen which shows more recent posts first, so an older, even short post, may temporarily get lost in the shuffle.
Word game threads can be tricky to moderate because it is better to delete some answers which were posted after others, but we don’t always have time to view the whole thread.
I hope this helps.
(I am not the moderator who commented earlier.)