Fair enough, but as you say, the request is reasonable. Even when I've carefully calculated how many turns I could leave my unit in miasma, other game developments ("Ugh, PAC and ARC just double DOWed me") have distracted me, resulting in a lost unit. In general, where the UI can capture and communicate information, not providing the information/notification in the most easily actionable way creates "artificial difficulty" (difficulty from obscurity, not difficulty from challenging game play).
An early BE example was the lack of notification when a city completed building something. Yes, you should be able to remember what the city was building, and does it really matter in the grand scheme of things, but ... really ... did that obscurity make the game better? As users raised that issue, Firaxis implemented a "City X just completed construction of Y" notification in the patch.