Because it would take a change to the constitution to do that while reinstating the old draft laws only takes a regular majority in parliament. The draft is a severe limitation of personal freedom, so you can't just do that by law. The draft for men is already enabled in the constitution, the draft for woman isn't.

At this moment, changing the constitution is not possible, there is no majority for this. So that pretty much took the option to change the broader parameters out of the discussion entirely.