Anyone who wants to provide some level of flexibility but within bounds. Say, you want to allow <strong> and <em> in a forum post but not <script>. It's not too difficult to imagine uses.
And is that sanitization perfect? Kept up to date?
With a safe API like this one that's tied to the browser's own interpretation of HTML (i.e. it is perfectly placed to know exactly what is and isn't dangerous given it is the one rendering it) wouldn't it be much better to rely on that?
Anyone who wants to provide some level of flexibility but within bounds. Say, you want to allow <strong> and <em> in a forum post but not <script>. It's not too difficult to imagine uses.