40 years ago, most outlets were **** compared to what you find today. Perhaps the improvements in across the board over that time have influenced your shift in opinion.
They ALL used to have awfully brittle face plates, and only ones will full steel back straps riveted to the body were safe. It used to be that cheaper outlets had thinner metal parts inside that would loosen up over time to the point that you'd get a high resistance connection to the plug, leading to plugs overheating.
I remember when I used to pay a premium for outlets with unbreakable nylon face plates. Nowadays, that's all you can get, and even the 49 cent variety are shatterproof. Plus, with full thermoplastic bodies, they now ultrasonic weld the cases, which IMNSHO is superior to the riveting of yesterear.
All of this has been through incremental improvements in UL standards. I find it unfortunate that most of this is hidden from the public view behind their paywall, but even if the changes are unseen, at least we get to reap the benefits.