One big problem is that there's a lot of money in this. If you "prove" something is real, and pretend it's a novel discovery, then you can try to sell a novel product that capitalizes off of that.

For example, there used to be a big trend in education, "evidence based learning". https://en.wikipedia.org/wiki/Evidence-based_education . The idea was science would be used to discover the best ways to learn/teach.

The problem was that the method of implementation would be software, or trainings. That you buy...

This reddit thread is a snapshot of the anger and frustration from that: https://www.reddit.com/r/Teachers/comments/jj6tvx/im_done_with_evidencebased_educational_research/

And of course, much of it was debunked later. Like learning styles, for example, were debunked. Although there was some good stuff, like spaced repetition, for which there is a FOSS app called Anki.

Psychology is kinda the same. People do science to try to back products, or trainings, which are then sold.

The inability to replicate these studies is ultimately not a failure, but a success. Science is still doing it's job.