I think you ask the question wrong. There can be endless debates about whether woman should fight or not. The _real_ question is why only German men are restricted by the law. Even if women do not fight they should be subjected to the same restrictions as they'd have country-bound functions in a war scenario as well - be it fighting or not. And I'd even go a step further and argue that the rule should apply to each and everybody in Germany. It's kind of ridiculous that German men have their movement restricted because of a hypothetical defense situation while Ukrainian men are not just invited by Germany to avoid being drafted and they can come and go as they like.

Having said that. The real problem with that law is not even the law itself but how it came to being, which unveils a completely messed up and incompetent legislative procedure in the German government and parliament.