In this case, most people (including, at times, myself) have fallen foul of the trap described here. That of thinking that setting a few breakpoints for smaller screens is enough to be responsive.
It reminded me of Jakob Nielsen’s 2012 article in which he advocated building a complete separate mobile site. This was a controversial viewpoint at a time when responsive design was becoming seriously trendy.
But seven years on, can we truly say the mobile web is a great experience?