Who actually claims that [Baumärkte] consistently offer lower quality? It depends on the product. And it doesn’t matter where the installer shops. If he doesn’t want to install provided materials, then that’s that.
Who actually claims that hardware stores consistently offer worse quality? It depends on the product. And it doesn't matter where the installer buys. If he doesn't want to install supplied material, then that's how it is.
Someone said earlier that specialist companies always offer better quality. I don't believe that either. What I do believe is that hardware stores are usually unnecessarily expensive.
And it doesn’t matter where the installer shops. If he doesn’t want to install provided materials, then that’s the way it is.
In principle, I wouldn’t mind buying everything from a single source, but most of the time they only have a limited selection, or am I mistaken? If I want a combination of wooden boards and a washbasin because I simply like it, I don’t know where the sanitary company would buy these wooden boards from, or what they look like / how good the quality is. I want to determine the appearance myself.