Computer gear, almost nothing. I still have my 2007 iMac, and it still runs music/MIDI recording s/w; but anything older (G3, Atari) I either sold or gave away. I still have my last two film cameras (Nikon F-4s, FM-2) but won't be shooting any more film, too expen$ive.
My big disappointment is the death of Surround-sound music. In 2010 I replaced my 30-yr old stereo system with a 5.1 system, including an Oppo universal disk player (plays both 5.1 SACDs and 5.1 DVD-A disks). I built a large collection of surround-sound disks, and was very happy. When Oppo announced they're leaving the disk player market, I bought a replacement/spare.
Well, the first Oppo eventually died, and now my replacement machine is starting to skip/stutter. These things can't be fixed, and universal disk players aren't made anymore. Sony and Panasonic do make Bluray disk players that will play 5.1 SACDs, but neither will play a DVD-A. I can't play those disks anymore.
This is especially frustrating in light of the resurgence of inferior vinyl playback, and even cassette tape (?!?!?) players, but no support for 5.1 disks. 😢