There are good reasons why flat sheets exist, and it has to do with hygiene, comfort, and versatility.
Do you need to use a Flat Sheet on your bed?
What are Flat and Fitted Bed Sheets?
White Bed Sheet Holder Bed Sheet Straps Fitted Sheet Flat - Temu Canada
Do You Need A Top Sheet? Bedding's Biggest Question Answered – Linenly
Should I Put a Mattress Topper Under a Sheet or on Top of It
Are Top Sheets Necessary?
How Often Should You Wash Your Bedding? – Strawberry & Cream Home
Yes, Your Bed Absolutely Needs a Top Sheet—Here's Why
What is a Flat Sheet and What is it Used for?
Layering Bedding Like A Designer tips and tricks
Bed Sheet Size Guide Sheets, Quilts & Pillowcase Sizes
Do You Need a Flat Sheet for Your Bed?
High Quality Weave Flat Sheet
Grey Stone Washed Bed Linen Flat Sheet - LinenMe