Pet peeve: the waste generated by appliances for which the consumables and/or wear components stop being available shortly after release.

Think air filters, non-stick grill plates, nonstandard vacuum cleaner bags, ear thermometer caps, seal bag rolls, and so on.

Like, you end up with a perfectly working device that you can't use anymore because you can't replace the one part that's worn out despite it being *expected* that that would happen.