These utility classes create a system that is no different than inlining css. If you have to add a class like font-size-20 to every element that you want 20px, you've lost both efficiency as well as any obfuscation from markup and css. Let's say your designer later comes back and says "Let's change the 20px font to 24px". You'd then have to make a choice between manually setting font-size-20 to 24px or going through your entire site and changing font-size-20 to font-size-24. You'd be choosing between making your naming confusing or dealing with a headache.
SCSS is great, but I think there are better examples for applied use.
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These utility classes create a system that is no different than inlining css. If you have to add a class like
font-size-20to every element that you want 20px, you've lost both efficiency as well as any obfuscation from markup and css. Let's say your designer later comes back and says "Let's change the 20px font to 24px". You'd then have to make a choice between manually setting font-size-20 to 24px or going through your entire site and changing font-size-20 to font-size-24. You'd be choosing between making your naming confusing or dealing with a headache.SCSS is great, but I think there are better examples for applied use.