With some exceptions, like lamps or tvs, older devices lasted much more. You can inspect the older devices you find around you and check for yourself. In general, they were much more robust and used better components and were designed to last. This was due to a lot of things that were different. I will try to list some:

• in some industry areas, growth in the market was mostly due to population increase, people who never got access to some things being able to buy them, and expansion to development countries, so it was better for the companies that the devices lasted long, because they wouldn’t be able to supply a demand of replacement + new users. In other words, there was no incentive for products with small life.
• devices were generally simpler, with fewer components, therefore, with fewer points of failure. The components used were often more “brute”, instead of the delicate electronic components we have.
• a lot of the modern obsolescence comes from software and from i/o communication incompatibilities, things that weren’t even present in most devices
• market demand forces prices down, and this has led to many things, including worse quality stuff
• the life cycle of everything has diminished, as the consumerism became stronger, and people are buying new things much faster, leading to users not even caring for things to last long, because they will buy a new one soon anyway.

These are the things that came to my mind. However, it’s important to remember that there are products being made out there with the same robustness level of old appliances. Look into industrial devices, for example. They’re build to last for decades and endure much more than common devices, but the prices aren’t inviting to the average user.