The complaint isn't about in-depth knowledge of "little pieces of felt or rubber to prevent my cabinets from being loud when they slam" or advice paint stripper

The complaint isn't about in-depth knowledge of "little pieces of felt or rubber to prevent my cabinets from being loud when they slam" or advice paint stripper suitable for particular wood types but simply being able to point the customer to paint stripper or pieces of rubber. And that, in many large DIY shops, is what the employees seem fail really well at. If I wanted in depth knowledge of how to do a particular job, I wouldn't be asking in a large DIY shop, I'd be asking someone who knows, such as someone at a small DIY shop who has earned their stripes or a professional tradie. And if I had in depth knowledge of how to do a particular job, I wouldn't be working at a large DIY shop pointing customers (or not, as the case often is) to where they can find M4 wood screws.