I'll consider keeping a note of this idea, but cosmetic improvements tend to be low priority (called "Level 5" or "Enhancements") over more pressing matters like balancing issues or an exploit.
Also, as Crane said, some monsters are designed around the fact that you don't know their true HP, and it being displayed visually would spoil the illusion and otherwise prompt players to cast their damage-buffing spells when only one bar of health remains. The Bile Worm is probably the most (in)famous example, and then there's the Injured Eagle and other monsters that don't actually die when you defeat them. It would need to be controlled whether to show it or not, or even how it's shown.
Fair enough, but realistically I don't see how it would remotely affect those bosses. The bar would simply constantly remain green or 4/4, exactly the same as the lookover (as that's what the bars are based off, if I'm understanding it correctly)
Cosmetic, yeah, but makes things much more RPG-feeling, and would dramatically help. Furthermore, the other reason making it so you don't have to lookover constantly is for latency reasons. I'm assuming most people here (even from US) will play NM with 150-200ms ping, and that's fantastic. Double that, and that's a "perfect" condition scenario for me given I live on (literally) the other side of the world to the server, and assuming 0 lag at all on ISP's/server's/whatever's end. 400ms just sitting in NM, goes upto 550-ish for bosses.
With the mass scrollage of crap at bosses, only way to even tell how much hp it has is to get lucky with when you look over and no one's hitting the boss, or just to do it, /scroll, then scroll a page or two and see.
The latter is the only reason I want this in the game lol. The RPG element is the "meh, why bother?" part since this is a MUD, not really an RPG (per se)