Why? Silly.
Nothing wrong with testing oneself. Proper application of testing, isolation, physical barriers against viral, bacterial, STD spread are proven techniques for MODERATING, to a great extent, the spread of many, if not all, contagious biological agents. Even works for birth control, except the testing part. Whada’ y’know.
Is the current covid variation a much less pathogenic version of the original? Very possible, and hopefully true.