Ideally you would want to play with the cat before feeding her so she associates food with hunting not as a cure to boredom. Even if you are too busy to do that, the act of giving your cat food can be a bonding experience for a cat that's stuck indoors 24/7. Many cat health issues can be diagnosed by keeping an eye of food habit since cats famously hide their weakness (to not signal weakness to predators, i would imagine). Free feeding cats would hide their illness till its too late to do anything about it.
Same with litter even if you use 'litter robot' keep an eye on the poop when you change the litter, common kidney diseases can be instantly identified by glancing at poop.