Obviously it's been made for exactly that purpose and does it well but for general e-commerce it's bad. The retailers are looking to send you to an area of their website with "stuff" you are interested in. For example you like toys because you're a parent who's buying your kids stuff for x-mas. The site wants to know that sort of thing and send you to the toys for x-mas section.
What Mcmaster.com looks like to me is an old fashioned mail order company that's converted their old mail order catalogue straight to a website, perfection.
Also note with Bezos tinkering with every pixel on the website is very old news, this doesn't happen anymore.
P.S. I'll eat the downvotes.