If we consider that the development of motricity gives access to mobility, this takes place on 3 levels successively:
The first mechanism for locomotion is crawling. While it may not be absolutely necessary for standing upright and walking, there is some research that stipulates that is relevant if one wants optimal performance. This study (https://www.ncbi.nlm.nih.gov/pubmed/2038537) highlights the importance of crawling for motor, cognitive and emotional mastery.
Kids that have crawled and kids that did not were assessed using the Miller Assessment for Preschoolers. This specific assessment actually focuses on motor and cognitive performance as well as emotional management (https://link.springer.com/referenceworkentry/10.1007%2F978-1-4419-1698-3_625).
Crawling seems to be beneficial for you as a whole. If you somehow did not crawl and you are walking, isn’t time to hit the floor?