Read some of the other comments, e.g. HD sells a Kohler brand faucet that has plastic internals, the valves are plastic, a higher quality store sells the Kohler faucet that looks identical to it but has an all metal construction with a slightly different part number. Lower grade lumber is definitely a thing, as is lower grade paint, and these local stores don’t have the ability to risk their name and reputation on stocking this cheaper stuff.

I’m not sure about the tools, but given that I know Walmart’s Black Friday deals are cheaper quality with different SKU’s it doesn’t surprise me that tool brands would sell cheaper made tools with less warranty to stores that want the lowest price over quality.