In view of the difficulty in estimating future events, would you recommend that

In view of the difficulty in estimating future events, would you recommend that accountants wait until collections are made from customers before recording sales revenue? Should they wait until known accounts prove to be uncollectible before charging an expense account? Explain and provide examples.
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Course Texbook:
http://solr.bccampus.ca:8001/bcc/file/fa667d22-26c7-487e-8d75-0e57ef8eece7/1/Accounting%20Principles%20A%20Business%20Perspective.pdf