Only cracked back glass in iPhone 8 plus

Glass is glass and glass breaks if it falls on a hard surface hard enough. Accidental damage is NOT covered under standard warranty. And the back glass on iPhone is fused to the phone and it cannot be replaced.

Your options are to either purchase an Out of Warranty replacement for about 60% of the cost of the phone when new or if you bought an AppleCare+ plan within the first 60 days of when you purchased the phone, you can exercise a replacement at a greatly reduced price.

Here is a link which details the prices (in the US) --> iPhone Repair - Official Apple Support

That phone did NOT shatter from a 1 ft fall, so don't even try to suggest such a scenario.

And if you want Apple to rethink their design, tell Apple. You are NOT addressing Apple here. This is user to user only.

You can provide feedback to Apple via this link --> Feedback - iPhone - Apple

As to whether you buy Apple again. As users we honestly don't care if you do or don't. But be advised that Samsung, LG, Huawei, Google ALL have glass backed phones, which can and DO break if they sustain a hard fall.

I said it before and I'll say it again. You are blaming the wrong party. You clearly didn't invest a few dollars in a protective case. You damaged your phone. YOU.

The back glass is fused to the iPhone frame, Apple does not "fix" this they replace the entire iPhone. There are supposed to be some 3rd party repair sites that can laser cut the back glass and affix a replacement, check to find one of them. Keep in mind if you go that route you may not be able to receive service from Apple in the future on that device. I've only seen one iPhone 8 that had this done and it was frankly pretty ugly. They decided to put it in a non-clear case instead. You could do the same and save the money if they iPhone is otherwise working properly.

Why don't you tell us how to make glass which can't be broken? Since you seem to object to the design, you can also tell us how to make a phone which can be charged wirelessly, without glass? I can answer both questions. Glass is glass and glass can be broken. And the back of the phone requires a glass back to permit wireless charging. A metal backed phone won't charge wirelessly.

Your anger is completely misplaced. Apple didn't break your phone. YOU broke your phone. No one but YOU. You should have put your expensive phone is a protective case. But you didn't and you're now here wanting to blame Apple. From the photo you showed, your phone sustained a VERY hard drop. Very hard indeed.

You have already sent your feedback. It is not a design flaw. You have had your options explained.

When you design your model of smart phone, be certain to incorporate easily changed parts.