I agree with the point you're making, but it doesn't seem to address my question. The author describes the usage pattern that I find myself in, and I suspect is relatively common among non-frontend devs: we aren't particularly skilled in CSS or other frontend web dev work, but every now and then we find ourselves wanting to make a quick, simple, but usable site as a landing page for some other project we're releasing.

For people in that niche, frequent tweaks/changes to the styling seem unlikely: I'm going to make the site once and unless it breaks I'm unlikely to come back to the code for it.

The parent comment I replied to makes the direct claim that this class-based pattern will bite me, and I'm curious if somebody can help me figure out how that would happen.