The point around work experience is that most universities recognise that it’s difficult for pre-degree students to get meaningful architecture work experience as most studios focus placements on part 1 and part 2 graduates. That means that applicants who have found placements are often more likely to be from a privileged or wealthy background and so admissions decisions will never be based on work experience content in a PS.
Reflections in a PS on the realistic understanding of what a career in architecture involves is well worthwhile - but there’s plenty of ways to get insights into that without a work experience placement at an architecture firm.