Only twice? How about 4 times as thick?

I just measured my iPhone 16 Pro’s thickness with a caliper, too lazy to read the actual specifications, got around 8-8.5mm. If we multiplied 5.6mm (iPhone 17 Air) by 4 that would be 22.4mm which is nearly 7/8” thick.

That would be an absolutely brick to lug around personally, I can barely fit my current phone with its otter box in my pocket as is and comfortably sit down.