This is because they understood the psychology of review process. The Editors and Reviewers of a journal are already professors who occupy high position in universities and research centers with very little time to read your paper let alone doing a systematic review. As a result, they generally judge your paper and proposals based on Scientific illustration and Graphical Abstract rather than on your in-depth analysis. Thus making a strong first impression with stunning visuals is crucial for paper acceptance. As images and illustrations etch in memory than words, the graphical abstract and scientific illustration enhances the first impression many fold. 

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If you take a look at the graphical illustration of high impact journals, you will certainly know that they have high quality graphical illustration. A quality graphical abstract and scientific illustration is non-negotiable for publishing in high impact journals, a trick very few has learned.  In general, the impact factor of a manuscript or proposal doubles with good quality scientific illustrations.