most of the stuff they change is not to make it better or to lengthen vehicle life but to make it cheaper and simpler to build and to reduce servicing times costs ,which the latter definately is detrimental to vehicle life ,l322 gearbox was originaly filled for life now even lr change the oil,when 300 range was made ther was a concious effort made to make things better,called rationalisation parts between vehicles became common ie wheel hub was same front back and same def,disco ,rrc,and easier to service ,this made it easier and cheaper for them and us ,but as now moved to the ridiculous or point of more money saved decreasing benefit to all in long run,to a point soon if not now ,ie changing whole wheel hub instead of just bearings,packing disco 3 roll bar bushes as cant change them once vehicles a few years old,filled for life gear boxes ,etc