It simplified cleaning a lot when all you have to clean is a single large pane of glass
Alternatively, a combined oven+stove unit where the knobs are on the front panel and can be pushed in when not in use. That way you have a single pane of glass and knobs that aren't an annoyance when cleaning.
Good idea. If we do this and also add some sort of positive label on devices that work locally and are interoperable it might start a positive feedback loop: More people become aware of the issue or simply want the device with the better label when choosing in a store, leading to more manufacturers producing more devices that aren't cloud-dependent.
Right now I often see the opposite happening: Manufacturers who don't even put on their packaging that their system is really just Zigbee under the hood for example.