Damn, I keep forgetting that the iphone X was already 5 years ago. 10 years ago then. There has been so little improvements in phones in the ladt 5 years, it all just blurs together.

I think the point is, we used to have phones that were 9mm+ thick. Iphone 4s and iphone 5c from Apple and Samsung Galaxy S3 and motorola G phones were all that thickness. They even had replacable batteries and expandable storage. Some of those were even waterproof despite all of that.

I think the main driver of impractical thinness has been marketing, planned obselecence and cost savings.