You need to make sure that the body of your question stands on its own. This means tags, and to some extent the title, should not be counted on to add content. It's really not a big deal to put the information right into the question where it belongs.
Some people, including me, simply tune out tags. Unless I'm searching, I ignore them and therefore even forget they exist. Since I don't regularly make any use of tags, my brain has long ago filtered them out. Tags are short by their nature, so there is really no excuse not to include any pertinent information they may add directly to the question.
Even if you think tags should be the only place for some content, you have to realize that's just not how many people will see them. To get better answers and fewer downvotes and votes to close for being unclear, spend the extra second per question. It's so easy to do, there really is no reason not to, and some reasons to do it.