The idea of the miter lock was to be able to create long rectangular tubes of wood that would have strong, perfect joints. The challenge of using miter lock bits was significant though. Adjustment of the miterlock has to be perfect and the wood must be very consistent in thickness, etc. Also, miter locks have a significant surface area, so a lot of wood gets removed when routing out a miter lock joint with all the consequent high forces and pressures.
I am wondering if all of this is now irrelevant, now that modern glues are "stronger than the wood itself"? Is there any advantage to use this complex joint over just gluing up a normal 45-degree mitre joint?