There’s plenty of stuff dropped, a lot of it is dubious tbh.

My older phones had: IR blaster for controlling TVs FM radio tuner Replaceable battery’s Headphone jack (as you noted) Expandable microsd storage Physical Keyboards (no real loss imo)

Probably some others I’ve forgotten. Honestly, I slightly miss the IR blaster on occasion. I haven’t listened to FM radio in ages, but could see it being useful. Replaceable battery’s would be nice from a longevity perspective, but I prefer battery packs to device specific batteries for longer life in general and battery life is more than a day for me anyway unless I’m going nuts. The lack of SD storage is the one that bothers me the most.

Keep in mind phones have gained at least a few things in that time. Simple reliable waterproof is a huge one.

Essentially yes. I don’t know how much of the designs but weight driven and earlier water driven clocks existed.

Quartz? Quartz clocks are about 100 years old. You make it sound ljke we went from sundials to Casios lol. Mechanical clocks are around 1800 years old. Pendulum clocks around 500 years old and spring mechanical slightly younger.