Are u sure? One half of the day I could do fasted cardio and have minimal food I take, causing accelerated fat loss, then weight train and move to an anabolic window thereafter, accomplishing both in one day. I can hit my macros, carefully timing nutrients and experience the best of both worlds.
You dont have to lose muscle while burning fat and u dont have to gain fat while building muscle. That is the problem right there - people think that both have to increase/decrease at the same time.
Not so, the body is selective of its source of energy based on activities and timing of nutrients. U can target fat loss specifically for a rather long time period and then shift to muscle building in the peri workout nutrition. Its possible, VERY difficult and lots of intentionality that most cant muster up though.