if you dont play a sport, cardio has little bearing on your overall success in improving aesthetics
will you have higher endurance? yes. stronger heart? yes. less fat? unlikely
if you lift and focus on progression and maintain a steady deficit, youll lose pure fat and keep what muscle you have
the less bodyfat you have the more likely you are to burn muscle while in a deficit(cardio, dietary or BOTH)
cardio for fatloss is a myth perpetuated since the 70s. due to people involved in athletics doing it, "common sense" would have you believe thats the way to get their body
question is were they ever flabby? ever?
^^^OP should ask yourself that, as well as many others who see these "eat clean, do hiit, etc etc routine"