I think maintenance calories are what we're trying to achieve at all times. Whether it be enough to maintain body processes at a mega-high activity level or maintenance calories for a low activity period.
So if someone is taking in an identical amount of good calories per day with or without PEDs, an amount that is not causing them to lose or gain weight day to day, isn't it a bit presumptuous to assume that all of those calories are just disappearing as a result of energy expenditure and waste removal? Surely some of those calories continue on inside the body retained as muscle, fat, and other tissue if that person is training properly.
My question is if you're taking in maintenance calories, why would hypertrophy not be maintained? Your cuts and bruises are still going to heal, your kidney and liver will still continue their cell replacement, you're going to continue to replace blood, why wouldn't your muscles continue to repair and adapt? Is skeletal muscle exempt from the body's natural maintenance?
This is why I never subscribed to the 'calories in calories out' philosophy which sounds like pretty heavy broscience. Calories are used in tissue repair, even growth, not just as energy. Calories go in, but not all those calories come out. Obviously surplus calories are going to assist growth and a deficit is going to stop or reverse growth but aren't maintenance calories ideally what we're trying to achieve at all times? Even if it's 6000cals/day with heavy training, cardio, and sauce?