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I believe (but don't know), that it's the same reasons as SRO does it - it's an easy to balance the cars without having to work out all the fuel tank sizes for each engine.
Spa 24 has a mandated maximum stint length of 65 minutes and they also have minimum pit stop times. This means they don't need to bother adjusting fuel tank sizes for each car and don't need to bother with fuel fill rates during refuelling. They only have to adjust the air restrictor or turbo boost to mess with engine power, and not then have to readjust fuel tanks and fuel fill rates to get that back in line.
This being the problem with balancing things - when you adjust one thing (in this case, engine power via fuel flow), you then knock out the amount of distance the car can go on a tank of fuel (and it's different for every car because they all have different engines), and the the time it takes to refuel said car. So then you have to spend a lot of time adjusting the tank size correctly, and then off of that you then need to adjust the fuel fill time for each tank size. And then you have the Manor issue - they ran in high drag, so use more fuel. So is the rate that the Manor used fuel at a good number to work off of? The amount of room for error is massive - any mistake at any point could knock one car quite far off. So the easiest way is just set a maximum stint length and that way you don't bother with fuel tank sizes and fuel refill rates. It's easy but it takes a lot away from the racing as you're essentially mandating the strategy everyone has to run.
Hopefully, it's just a temporary measure until they work it out, because it was a complete mess. Same with the new pit stop regulations - it took a lot away from the two races. Changing that back would be a huge help and allow strategy to become important again.
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