Excellent video by Darrel Braun guitars:
There is no measurable difference, and no audible disadvantage to the cheaper magnets. In another video we see that in blind tests people can’t easily distinguish a £5 guitar pickup from a £100 pickup, provided the guitars are well set up.
There are endless ways of improving and creating options of the tone on guitars. Skill and experience are tops, heavily advertised pricey components are not