Constructive ideas sometimes face cold receptions from insiders who have developped conceptual rigitidy and sometimes identify a theory with the thematic domain of a field, unable to see the theory as just a conceptualisation compatible and within it.
Einstein received a lot of "inertia" for his ideas like energy-mass equivalence, although he stayed comfortably within the paradigm. But others were not so lucky because they "threatened" or streched the paradigm uncomfortably to receve certain ideas that threatened some aspects or pylons of the superstructure of modern science thus possibly demanding some paradigm redefinitions if proven fruitful or powerfully illuminating