Almost any car can go 200,000 miles these days and exceptions (Hyundai/Kia engines, Nissan transmissions) are well known and excoriated.
Pre OBD2 cars just didn’t do that. 100k was a significant milestone for the life of the car. Today, it’s a preventative maintenance milestone.
Shitty plastic parts aren’t a feature of modern cars, just lousy companies. I had a 1991 Dodge Spirit in college and high school that had a little plastic part in the distributor that broke when it got hot.
When it did, the car would just stop if you hit a puddle or turned right quickly. It did so enough that I kept two spares in the trunk. One time the car died on the ramp from the GW Bridge to the West Side Drive. I just stopped on the ramp and fixed it, pissing off hundreds of people in the process.