I see where you are coming from and don't worry: when it comes to comments that have a tendency to spark hate, I keep an open mind.
It's highly unlikely that you will be able to finish a titanium level without your sword arm, but I can still see it happening. Honestly, I agree that it can be annoying, and I can think of a way to fix it, but I don't want to be in a position where I'm sounding like I am telling Doborog what to do with their game. I also halfway agree with your disdain for the visual cue - I think having the robots spark when damaged is a little too much, but I feel you should at least KNOW that your robot is at the verge of a "death by poking" - this visual cue for your own health can be as subtle as a colored square beside the energy meter, for example, and that doesn't interfere with the overall game in my opinion.
I have a question for you because I am honestly curious: Do you have a better idea on what should happen if your sword arm gets cut off?