I absolutely hate the "marketplace" trend where you have to be so careful about who you are actually buying items from. I first noticed this with Newegg which has been my go-to for computer parts, you have to go out of your way to find stuff sold BY NEWEGG. I have not noticed this with Digikey yet but maybe it depends what you're looking for. The thing that does drive me nuts about Digikey is how they changed it a while back so that the parametric search parameters are hidden and I have to click Show More EVERY SINGLE TIME I search for a part, it's infuriating. I don't know what they were thinking, it's clear that whoever they had design their website is not an engineer and has no idea how engineers search for parts. It's not the same as shopping for a tshirt, ALL of the parameters matter, every time.
At least Digi-Key’s marketplace seems to consist only of carefully curated vendors. DK has supported drop-shipping from manufacturers for a while, and DK itself handles logistics for some manufacturers’ own stores. (I ordered a TI book from the TI website, and while the name “Digi-Key” didn’t appear anywhere, it shipped in the same exact types of packing materials as DK (same slashed paper padding, blue zip bags, and label layouts), and shipped from Thief River Falls...)
I have nearly entirely stopped using Amazon because of the marketplace BS. (It’s maddening for Switzerland because FBA vendors cannot ship here, yet there’s no way to eliminate them from search. So other than for books, I’d say that these days, 90% of the search results on Amazon.de (the Amazon for Switzerland) can’t actually be shipped here.) IMHO they’re the poster child of marketplace done wrong. DK seems to choose carefully, and makes it trivially easy to exclude them, but I’ve never needed to yet, since only a vanishingly tiny percentage of DK’s SKUs are marketplace.
DK’s parametric search isn’t perfect, but it’s hands-down the best of any electronics distributor, and possibly the best I’ve ever seen anywhere, for any kind of product.
P.S. it looks like DK is testing the updated UI on US customers only. DK’s site for Switzerland, for example, is still using the old interface.