I don’t know if it’s that crazy. The form factor of laptops, and computers for that matter, has pretty much stayed the same for many decades and still going strong. It’s entirely possible that this slab phone form factor will stick around forever.

Off the top of my head, random list of older things that haven’t significantly changed form factor in forever:

• Writing tools (pens, pencils)
• Notebooks
• Chairs, sofas
• Cars (pedals, steering wheel, gear stick)
• Cookware (pans, pots, etc.)
• Utensils (knives, spoons, forks)
• Clothes (for men: trousers, shirt, underwear, socks, shoes, jacket/coat)
• Drawers
• Doors and door knobs/handles

Maybe some of those I’m wrong about, but certainly not all. Sometimes, a form factor just sticks around.