A car is required to have an MOT after its third year for the rest of its life
Its supposed to confirm the general condition of the vehicle and siuitability for road use, but as soon as the car leaves the garage, there is no guarantee that the car is actually roadworthy.
Theoretically a motorcycle can be ridden into an MOT station and pass even though there may be no engine in the chassis.
Logic ? you'll try to convince me theres a need for politicians next.