bike disc brakes operate identically to automotive disc brakes, which have proven to be very maintenance friendly and perform very efficiently.
there is no reason to bleed brakes unless the hydraulic system is opened due to leak or replacing a defective component. when is the last time you bled the brakes on your car unless the mechanic upsold you to a brake fluid flush? the brake lever pull will slowly fade as the pads wear and when they are replaced brake lever returns, same as your brakes feel better on your car when you replace the brake pads. Your cars brakes do not require bleeding when replacing pads, nor does your bike. overheating brakes can cause damage but that is extreme and unlikely and just a likely to happen with rim brakes.
there are certainly two camps and both systems work well and continue to improve with technology.
I would certainly prefer disc brakes on my loaded touring bike, rim brakes are great on a light road bike.