Within all types of activities an enormous amount of conclusions, experiences and belief structures are collected. Within philosophy of science, belief structures are called "paradigm".
Paradigms evolves continuously
Belief structures or paradigms are found within all human activities, for instance politics, philosophy, sports and music. As we gain additional experience within an area, also the belief structures within the area evolves. Belief structures are therefore seen to evolve continuously within many areas.
The additional experience rarely implies that the previous conclusions were erroneous, they were merely less complete than today. And tomorrow we have probably learnt even more about the area.
At rare occasions something is discovered, is invented, or just occurs, that radically changes the belief structures within an area. Examples are a political revolution, a new type of instrument like electric guitar or synthesizer, or the possibility to buy baker’s yeast for baking.
Such radical changes sometimes become publicly known, as opposed to the less remarkable common development within an area. Therefore a belief may exist that changes in belief systems are common and that an area cannot evolve without them.
The public may also have missed that a new belief system is not necessarily incompatible with earlier opinions, they may be just complimentary.
A football team today uses different tactics as compared
ago. This does not imply that football played at that time
years from now, the game, the rules and the balls will probably have evolved further.
When Jimi Hendrix during the sixties howled his guitar sounds it implied a development of both his own and other's handling of guitars.