In an ideal world, yes. But for now, putting it in the Short Description (ie. title) field works well enough.
Another peeve I have with On Hold incidents. We currently have a number of staff working Incident Management who will take a job, send an email to the client saying, basically, "Here's how to fix the problem: do this, do this, do this and reboot. Let us know how it goes." And then they put the incident On Hold. The instructions they are sending are reliable and are known to fix the reported issue.
To me, this incident should be Resolved, not placed On Hold waiting for them to contact us to tell us it worked. People don't do that. Once they've got the problem fixed, they don't care about our incidents any more. Doing a followup wastes my time and theirs.
Ah well. I have a week off next week. It's been prearranged for ages because I knew that by about this time of the year I'd need to take some downtime. And I do. Thanks, past me!