I think there are plenty of good things made out of plastic. Legos never break, for example.
Particle board furniture is annoying. You scuff off the veneer, and the item is essentially ruined. Wood is "self healing" in the sense that scratching it exposes more wood, so it doesn't look as terrible.
Personally, I've found software to be the worst thing about modern devices. A long time ago, I bought a terrible Tiertime 3D printer. It doesn't accept gcode from the computer, so you have to slice models using their proprietary app, and it's absolutely horrible. Requires registration before use, doesn't work at all. I used it once, was disgusted with the software (being unable to slice a model more complicated than a cube), and put the thing in the box with the goal to return it. For various reasons that never happened. Three years later, I decided I was tired of looking at the box and can always use another 3D printer, so I did a "brain transplant". I replaced their proprietary logic board with an open source one (Duet 3 Mini 5+). Now the printer works great. (Before the project was done and I was getting my bearings on the internals, I was appalled at the shortcuts they took. Sheet metal instead of extrusions. Heated bed connected to the power supply with flatflex cable, hotend connected with a ribbon cable, 19V power supply instead of 24V just for a tiny bit of extra savings on inductors. But honestly, the design is fine, it was just their software that made it unusable. I learned a lot about cost reduction by taking that thing apart, and I'm impressed how good of a job they did making it cheap without actually making it work badly. The ABS enclosure is also top notch, some of the best injection molding I've ever seen on a $300 product. No way you could make something that good yourself for the price of the whole machine.)
I've also had some good repair experience on modern, cheap, made-in-China electronics. I have a Siglent oscilloscope, and one day, one of the knobs locked up. I resigned myself to just never using that channel again, but on a 2 channel oscilloscope there aren't really channels to spare. Knowing I wasn't going to find $10,000 laying around for a proper instrument that would have good encoders, I begrudgingly opened it up. Everything was held together with screws, and I had the front I/O board out in a half hour. Desoldered the broken encoder, soldered on a random encoder from my parts bin, put everything back together, and ... perfectly working oscilloscope. It wasn't unrepairable, it was merely uneconomical to repair. If I was writing software instead of repairing the 'scope, I could have just bought a new one. But it was some Saturday night at 3AM when I was too tired to do anything except watch crappy YouTube videos, which nobody will pay me hundreds of dollars to do. So it ended up being quite economical.
I forgot where I was going with this, but basically if you can open something up, today's manufacturing is as good as any manufacturing in the past. Someone that wants to repair or mod, can. (Until you run into glue. Oh how I hate glue.)