Disagree with this too (well, the last point). 😉
Having a bad blog is 1000 times worse than having no blog. If you can't write, don't. I haven't heard of people failing interviews because of a lack of OSS or blogging, but I've certainly seen CVs rejected after their blog was linked and the content deemed to have demonstrated that the person isn't great. The same goes for old blogs: if you haven't added to your site for years and all the content is about old tech that's no longer relevant, don't link it in your CV.
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