tags: <strong> and <em> and <b> and <i> could also be controlled by CSS classes

These elements add some value to the text and context on the back side, but not so much on front end.

If you add a css class to it then u can also design it to look more recognizable to frontend user.

I guess these things can be useful regarding SEO and Google search result as well.

<p>Do you like <em class="product">this type of ice cream?</em></p>

Do you like this type of ice cream?