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It's a combination of things to be sure. To give a simple example though, turbine engines are inherently much less likely to quit running than piston engines.
Airline comfort has drastically and steadily declined over the past couple decades, long after commercial airlines started using jets. Maybe not to the level of that first picture - cattle class has been around since I was a kid - but passenger comfort has been measurably squashed just in the time I've been travelling as an adult. Safety hasn't correspondingly improved as a result of technology in that time.
Safety has improved considerably in the past couple decades in the USA.
There's probably no causal relationship to declining comfort though. Comfort has decreased for two reasons:
But, again, most likely due to more stringent maintenance, training, and procedural regulations thank because of any technology improvement. American's average plane age is 11y/o; United is 14 y/o; Delta's average plane age is 17 years old. Despite bring nearly half again older, Delta's safety record isn't much worse than American's. There's little or no correlation between fleet age and safety, and it's more rational that any increased accident rate of older planes is due to wear and tear and general ages of the planes rather than the technology in them.