At a minimum, it seems like a good way to run a cheap and quick way to try to validate an idea before dumping more time and money into it. If it seems like there is something there, then a longer and more expensive study is easier to justify. And when that study does happen, you'll already have data on what people expect to happen which is nice.
It's not a perfect method for sifting through ideas, but at the end of the day you need some way of deciding what to pursue now, and without time travel there is no perfect method.
And because methods are included in publications, from a scientific standpoint there's nothing wrong with publishing it. Other researchers will read the paper and clearly see what was tested and be able to assign an appropriate amount of significance.
That significance may also vary through time. For example, somebody might conduct research about the accuracy of these imaginings in various ways. Maybe we find out we're actually quite good at them in some ways, and not so good in others. Maybe this is already done, and is why you've seen several recently? I don't know.
The problems mainly come from the popsci aspect. (Some) Writers and (some of) the general public see 'scientific paper' and more or less base their own assessment of significant entirely on that. You can also get a bit of the 'telephone game' going on, and the significance can get all jacked up. I don't know how to solve this problem, but I don't think the correct solution is to alter the scientific process itself.