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I'd say it's a prerequisite. A lot of people, including myself, can lift as much as they want, eat as much as they want, and be left with a big tank for all the effort.

If real potatoes could whisper like that we wouldn't have this problem.

Muscle passively burns fat and depending on the activity of the muscle and its density may burn more fat and require more nutrition.

The value of cardio is multi-facited for health and weight loss and should not be ignored.

Tge heart being an active muscle 0assively burns quite a few calories, a stronger heart will burn more calories in essence cardio is lifting/resistance training for your heart.

The heart and its heapth and strength have a durect impact on immune function, healthy vascular function, efficiency of resource distribution blood clots, it's likely this is all the result of brute force blood pressure changes and vascular dilation and contraction bit also that much 9f a body's immune functions are focused on preserving the heart and with less need for management overall weight on the immune system is reduced, incidentally cardio is great for your lymphatic systems which act as the hidden sewer system of your body.

Additionally cardio causes muscle cells in your legs and core to enter an active state and dramatically increase their caloric use for hours on end if you build muacle there and then cause that muscle to activate with even light cardio the caloric inefficiency you have created will aid in weight loss.

And finally just as anaerobic exercise spurs muscle growth and beneficial hormone activity which creates better impulse controll and can help calm and balance the mind, cardio has a similar effect on mental heapth by providing a source of feel good chemicals and rwgulating the production of auch neurochemicals likely as a result of the same vaso-dilation and blood pressure changes which help clear plaque even in the brain and should aid in sleep and recovery from depression anxiety and other stresses.

Balance for your own needs but I recommend 70% of your workout time in a week be weight lifting or strength training and 30% be cardio if weight loss is your goal.

Planning for noobs should be done in thirds, 10 minutes of walking and twenty of bodyweight and light lifting a day for beginners, for optimal results get ready to waste water, do one activity in the morning and the other shortly after your final meal of the day, shower after each and finish with a freezing rinse. If you do the cardio first once your body adapts to the cardio you're doing do it before eating.

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You are right, but it’s not because it makes you look “manly”. Testosterone actually builds more muscle and muscle itself burns fat and calories.

https://www.militarytimes.com/off-duty/military-fitness/2015/01/22/lift-more-for-a-smaller-waist-weight-training-vs-running-to-shrink-abdominal-fat/