How is it stupid? It would be easy for them to add a simple delete button.
Believe me, this is actually a stupid button. And there will definitely be someone who will click on it by accident, and then be indignant that lost troops.
Is it so difficult for you to simply release troops you don’t need into battle and end the battle? Here's the whole deletion function - the troops you don't need will disappear. Or do you have such an EGO that for the sake of your convenience you cannot even suffer a fictitious defeat?
P.S. It would be better to ask that the level of these troops rise along with the level of your development. But to implement this by BHG is already in the realm of unrealistic fantasy.
P.P.S. I recommend that you carefully read the forum first to understand that your requests are “into emptiness”. Even if you prove that you are right, no further action will follow, and you have already heard the opinions of other players.