OP, I think you've played a very different board game then I have for the last 25 years.
Also I do not understand what "gentlemen" means in the context you are using it.
Standard Total Warfare rules all the way! Alternating movement and simultaneous weapons fire. Gentleman's warfare is exactly how it is portrayed in "The Patriot". I stand there, you move, you shoot at me, then I move and shoot at you if I am still alive when it is my turn. You can see a clear distinction between modernized simultaneous combat and gentleman's warfare.
In Battletech you can move behind my guy, sure, but then before you move again I can have any mech within range engage you. You may survive, you may not, that is your gamble.
In HBStech, you just move last, shoot the opposing mech in the back and then, given the right perks or weight class, you can move again and save yourself. It violates the limit of disbelief that your entire lance would stand there and do nothing as a mech runs through your line, shoots your mech in the back, then runs away without ANY retaliation. Anyway, this is just one problem of the vast many with gentleman's warfare style gameplay and why I won't touch 40K or organized Xwing.
Total Warfare is the most balanced and fair ruleset I have ever seen. Everything that happens is based on the dice and very direct. They tried to reinvent the wheel and (IMO) failed - as far as the gameplay goes. 2-3 adjustments could be made to make the game Total Warfare and it would be infinitely more fun but, they chose the route that would wind up with units dropping off faster for the short attention spans of the current generation of game players.
Is it fun for a play through every few months? Sure. Is it something I will be playing over and over? No. And that is what disappoints me most of all. I am still trying to get MW4 mercs running (18 year old game) over putting more hours into this one and will soon be trying to get MC2 running as well. I am a diehard Battletech/Mechwarrior fan and a turn-based addition to Battletech (IMO) was the wrong way to go.