Ziggy's Shadowrun Wednesdays
Job tags are quick descriptors to give you an idea of what a mission may involve. That is not to say you can’t think of a way around them, but in general the mission should include these elements. Generally “in-game” these are the things that the Johnson believes the mission will involve, so potentially other things can become involved as surprises.
Missions with the Combat tab will pretty much require you to get your guns out. Either the Johnson needs you to shoot someone up specifically or they are sending you into a scenario with lots of itchy trigger fingers. Take these missions if you feel like a fight.