Some might, hehe, of course, but in any case, papers can get very complicated, since they have to give al the details so that the whole research can be repeated by an independent research team. Review papers, on the other hand, don't need to be as detailed and complex, but they relay on references to original papers (primary sources).

For casual reading, as you stated on your original question, review articles should be appropriate, indeed. Their authors already made the systematic review, the filtering of data, facts, and results, and the summarizing and discussion of many research papers. Occasionally, you may find some details interesting enough for you to check the bibliographic references, get a copy of the original paper and dive into it.

Libraries, mainly in universities, subscribe to many scientific journals, and if you have access to them, you can get a copy of individual papers through them. And in some cases (see [PLOS](https://plos.org/, for example), the contents of the journals are of free access, since the authors pay for publishing.