No. It is only taboo at basic training. Mission-focused delegation of authority in modern militaries specifically adresses this. Leaders are encouraged to take initiative, which often means abandoning a failing plan. The ability to quickly recognize failure, "give up" and reattack a problem is what separates western forces from the drills-based approach of the post-soviet block.

https://en.wikipedia.org/wiki/Mission-type_tactics

(Even at basic training, giving up is a thing. The only true failure at basic is getting oneself or others injured.)