Well, you COULD leave it out and still look professional, but like the original post makes clear, you would make a huge amount of work for yourself. By using CSS, you just write your style once and reference it within the code of each page you publish. If you need or want to update the style of your site, you just go to your CSS and edit it there, and the changes are instantly applied across the website, not just on one page.
Without CSS you would have to edit each and every page, one at a time.
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