Cordless tools, medicines certainly, oils and lubes, most farm implements, the better quality hand tools, microwave foods, bearings...lots of stuff. I suppose it depends on what time period you want to compare to and in what fields. Chainsaws of the 90's were on many cases better than what you get today. Tractors of the mid 60's to about 1980 were better built than today, not so many bells and whistles, but better for using even if they didn't have AC and Bluetooth. Computers for me didn't even start till almost Y2K so I'm no expert, but IMO they were easier to use and built better in some whys during 10 years ago or a little more. Yeah, they hold a lot more and are faster now, but a lot of that space is taken up with junk and they watch your every move on line, so I'm not sure how much of an "improvement" that is.
Tires aren't as good, but the availability of odd sizes is better. Moulds are way better, in fact I've been saying for some time this is the Golden Age for casting, or was until they did away with lead alloy wheel weights and US lead mining in general. Some plumbing stuff is way better, PEX vs some of the earlier "plastics" or galvanized. OTOH, whoever thought up having a toilet with nooks and crannies at the base was a freakin' idiot that apparently didn't own a dog or ever miss the bowl for a fraction of a second in the dark of the night when he was a boy.
Some is better, some is worse. Food quality I think has dropped, or maybe I can't afford the better stuff. Fuel quality surely has dropped,but so has the price. Lots of toss ups out there too.