Whenever I read literature review papers, I find that authors start with a very big number of papers representing the area (sometimes in thousands) and then end up with a few numbers of papers that are actually included in the review. The majority of the time this number of actually reviewed papers is less than 10 or 5 percent of the total papers they started with. All in-between is subjective and disguised. This somehow raises a question about the existing process: Why do I need to start with a large number of papers? I can define the inclusion/exclusion criteria in a way that I collect only the closely related papers. With well-established inclusion and exclusion criteria, there can be a gap of 10 or 20 or 50 percent at the maximum between the total number of papers received and the papers finally reviewed. Am not able to favour the gap of 90 percent or more especially when there is a well-defined inclusion/exclusion criteria followed.
You may have a look into these related discussions:
https://www.researchgate.net/post/What_are_the_lower_and_upper_limits_about_the_number_of_references_in_Review_Articles_Is_there_any_protocol_for_that
https://www.researchgate.net/post/What_is_the_minimum_number_of_papers_for_a_review_article
https://www.researchgate.net/post/How_many_papers_should_be_reviewed_before_writing_a_review_article
On review papers in general, see also:
https://www.researchgate.net/post/Review_article_writing
https://www.researchgate.net/post/What_are_the_most_important_elements_to_consider_in_writing_a_review_article
https://www.researchgate.net/post/What_items_should_I_consider_in_writing_an_effective_review_article
https://www.researchgate.net/post/What_points_are_to_be_remembered_while_writing_a_review_article
https://www.researchgate.net/post/How_do_I_write_a_review_article
https://www.researchgate.net/post/Any_prescribed_standard_format_for_writting_review_articles
https://www.researchgate.net/post/What-about-the-novilty-in-writing-a-review-article
https://www.researchgate.net/post/How-do-you-write-a-good-review-paper
https://www.researchgate.net/post/How_do_you_write_a_good_review_paper2
Literature review papers are tool to know latest findings lots of research compile in one article furthermore u can find similar discussion
https://www.researchgate.net/post/What_is_the_minimum_number_of_papers_for_a_review_article
https://www.researchgate.net/post/How_many_papers_should_be_reviewed_before_writing_a_review_article@
Often 'Literature Review' is a result of 'dive bombing into GOOGLE! The issue is RELEVANCE.
It should be 'relevant' to the TITLE and the stated RESEARCH STATEMENTS - to limit the scope of this particular research project.
Based on the Research Statements (around 3 ?) the review of existing literature should be examined to satisfy the existing knowledge and then stated further research, as recommended by the paper. This then extends as the 'gaps in the knowledge', of the research statements. There should be a strict RIGOUR applied in the collating the stated statement and the 'research gaps'. This then forms the core of the Research Model for the stated research, following the Title.
Then there must a ROBUST appraisal of the new primary data resulting from the dedicated Research Model and its application to the research, within its Assumptions and Limitations.
Following the results, of course the document must 'lay the seeds' (recommended research) for the next researcher!
Yes I read and write literature reviews. It basically helps to understand a particular paper or a bunch of papers in a nutshell. In case of systematic reviews all the published works regarding one particular topic till date can be accomplished so that it can help to design a new work in that field.
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