Weird. Bike drum brakes don’t have any hydraulic cylinders, they’re mechanical. On a disc brake the cylinder at the wheel is the slave cylinder. The hand applies the front brake the foot pedal applies the rear brake. You can get just as serious brake fade with a disc brake as you can with a drum. Disc brakes are perhaps easier for unskilled setting up at the factory, drum brakes must have the shoes centred and linkages set just-so. I really don’t understand how RE India are setting up the rear drum brake incorrectly by painting the cam/bush in place when for many years RE Redditch supplied this brake to so many other bike manufacturers in England, they know how it should be set up, when it is re-assembled properly it works very well indeed. I like the disc on the front, it is confident and requires practically no attention until it is time to replace pads and disc(which will wear out). The rear requires routine adjustment. So many riders out there have no mechanical skills whatsoever that they simply won’t think of adjusting the rear brake from time to time; one of my mates doesn’t know how many cylinders his 1200cc Honda has, not a clue, doesn’t need to know, he just gets on it and rides it; same could be said for most car drivers, turn the key and go.