Gaz is right unfortunately a lot of people wait till mot time if it fails fix the fails then unless something breaks in between nothing gets fixed till following year.
But at the end of the day an mot is a basic road safety check.
Tony to address the points you made on a lot of larger modern cars you have no chance of fully compressing suspension enough due to spring rates multi link etc various ones of the mot sites i work in are atl and when you put something like an audi a6 s line on the shaker plates it barely moves compared to maybe a hyundai i10.
Again unfortunately a strip down style mot would then take considerably more time so then a much larger cost would be involved and also opens up a whole minefield of potential damage being caused in the dismantle so think in a lot of ways dvsa hand are tied by various factors.
Sorry
@Simon Blythe for dragging your thread slightly off topic