That’s a cool idea for new production! I picture new stuff mass produced by this society to be standardized, repairable, and somewhat clunky to facilitate the first two. Appliances with more exposed bolts, perhaps some motors exposed the way old tools are set up, where it’s easy to swap one standard motor for another with four bolts and a belt. I figure if you want super sleek consumer stuff, maybe a phone glued into a glass shell or a washing machine you need special tools to disassemble, you might look to items left over from the previous way of doing things. Or you might go to a smaller workshop making custom or specific products. When I was outlining a story the other day, I had an engineer type bemoaning how messy this society is, that the cultural need to find a niche for every still-working piece of machinery rather than throw it out basically means they’ll never truly be free of imperial units and will work with mixed tools for generations, until the last old world engine or turbine finally dies and gets melted down. As for customization, I could see the standardized stuff being offered in a kind of bare bones version, the way the default raspberry pi has no case and no peripherals. Especially with tech I could see a lot of people assembling their own creative cases and layouts to fit their needs and express themselves.