Coolant issue is actually a delicate one. As many action, coolant main purpose is to keep game faster-paced, as tabletop BT(and MW2 for some extent) was full of rounds in waiting for a cooldown. And if in tabletop you just passes the move for an overheated mech, in a sim this means having an enemy in a reticle, being unable to fire an energy weapon, but holding yourself down, as you just override a shutdown and even SL could make your reactor go critical. Quite frustrating, it was, I can tell you. It was many, many times I had my mech destroyed by overheating in MW2 just because I thought "one more laser salvo wouldn't kill me".
Coolant, on the other hand, helps keep heat at bay, letting the game have less moments of "standing and waiting to cool down". Heat management is a balancing issue and one of cornerstones of a BT, but it could kill the pace of a real-time videogame in no time. You could think of coolant as of "ammo for being active on a battlefield", as an opposition to "fire rarely, move slowly and waiting half a minute after using JJs".
If coolant is removed from the MWLL, it would tone it's pace dramatically, as more time to cooldown woud be needed. Mechs with better heat management would shine brightly, while ones like Cougar B or any Awesome variant wouldn't be as attractive as they are now. In other words it would be a completely different balance and much slower game. I, personally, would like it that way, maybe even more, than "MWLL with coolant", but I doubt devs would do such thing as severe reduction of coolant amount, or it's complete removal.
Tl;dr: I'd like to have no coolant whatsoever, but MWLL combat would be slower without it, so a hard time getting devs to do that.