By some people's logic, armies should still be lining up in 2-3 ranks and firing at each other in open fields until one army folds? Don't go hiding in cover and shoot, or try and ambush people! That's just dishonorable!
People have this romaticized viewpoint that klingons should ALWAYS give the other guy a chance to win and fight to the death!
Remember that DS9 episode when martok commanded 5 bird of preys into hit and run missions? If we're going by your logic, then:
1. Those guys won't hit and run but kill everything until they die
2. They wouldn't try and go back to their own lines like "cowards" rather they should've all died glorious deaths when faced with overwhelming odds.
Running away = cowardice? /lol. It's called a tactic. Calling the running guy a "coward" to try and anger him is also a tactic. Psychological warfare is very underrated.
And remember, this isn't an accurate representation of ST, which is fiction after all. It can't and never will work like ST canon. Why? People are people. Some adhere to this knight-in-shining-armor goodie goodie ruleset in combat. Others will hunt you in cold blood. Some like to RP, some like to PvP, and some (like me) like to make fun of PvE people. (PvE is hard yo!)
Telling BoPs that, even with the flimsiest hull / shields and 1 less bridge officer slot, they need to stay and fight to the death instead of actually using battlecloak to try and regroup with others if losing, is laughable.
The B'rel is further penalized by having this "enhanced battle cloak." I don't necessarily agree with mustrum's idea, but saying klingons should always fight to the death is like saying "we feddies can't kill you when we already have all of these advantages on our sides (for more on this, ask any pvp veteran which side's favored right now in team v team matches). Please stay and be penalized further cause we don't want to fight fairly!"