The true downside may simply be that, though the content is the same, people learn dev articles proactively, while going to web sites like mdn specifically to look issues up as they need them, so even simply copying the same information into a platform like dev might assist by bringing it to folks's attention. Apart from that, dev just seems to lack a solid idea for selling creativity and expertise above repetitive content, so when people do write a short publish about some cool factor they're doing, it normally just disappears in the sea of listicles and newbie tutorials. I doubt a 26 years previous that has not been grown up in a toxic setting would instantly start to post copy-pasted stuff and insulting people