They Should Add An Official Damage Meter With One Condition

[Shurrikhan]

Best place to put a damage meter would be to attach it to the "record" feature, and then they just remove the limitation on what missions you can record.

Once it's recorded, a few minutes after, the next playback gets you bars and details and breakdowns.

Ideally, though, you want to make this kind of at-a-glance information convenient enough for casual experimentation as to keep it a quick, accessible learning tool. Boxing it instead into a feature within a feature is... not that.