I was thinking, what if they fix the weight of the hardware wallet? Like, the X model will weigh X grams, and they leave no room for removing anything.
~snip~
Also, they can make their devices visible, so we can look directly through a transparent body, or make a layout verification system so easy for new buyers that they can open and close the hardware wallet and confirm within minutes whether it has been tampered with or not.
I think a list of each device's total weight is already on the Ledger website (
here),
And electronic products have errors in all mass, when I was reading Reddit today, I noticed that when comparing the same models, users were panicking because of the differences in grams. 34, 35, 36... but all this is normal

But the website doesn't mention this. For some reason, they only list the weight, accurate to 0.1.

And this further increases the panic.
Weight checking will never provide protection. An attacker can simply grind down the inner walls of the case, making them thinner. This will provide a ground buffer for their chips.
Trezor has those, too, but listing the weight individually per product (
example). Also, just as you said, a lot of users suggested that transparent cases/body should now be mandatory. There's also a suggestion on X to deliver the device unassembled, meaning the user would need to piece it together to be able to use it. Going that route, each part would need to be modular so average users could easily assemble them. Not a bad idea, but the devices would probably come with a higher price tag. Ultimately, I'd wish these manufacturers would build tamper-proof devices, maybe fill the entire empty spaces inside the device with resin? Or is that too much to ask?

Thanks for the archive link. Now I have something to compare with.
Disassembling the case isn't a great idea, as many users will go to the manufacturer where the hardware wallet is assembled. Few people want to play the "build your own wallet" game.