And frankly, science has become so large and specialized that many if not most of the investigators work on extremely narrowly-defined projects. That is how it should be.
But other scientists investigate much broader subjects - e.g. cosmology, geometric physics, evolution. Unnecessary restrictions in these efforts can be counter-productive or misleading.
All well and good, until it's time to start looking at what restrictions are "necessary" and which are "unnecessary".
The scientific method restricts submissible evidence to being what is independently verifiable. This is done in pursuit of trying to insure that the research is done objectively. Submitting that some disciplines or subjects should not be subject to that restriction means they will not be held to that standard of objectivity.
What's the criteria for deciding which disciplines and subjects need to conform to that standard, and which don't? Is molecular biology a "broad" subject, or a "narrow" subject?