Is it a cost saving measure / sneaky margin increaser, or what might be the motivation?
Edit:
Touch interference is a good idea. Still, from the picture, it looks like the bezel could be half as thick and work well. Sorry to be such a stickler, I am genuinely curious if Apple is chasing better margins, the best feasible UX, or something else.
Could it be that since this device is only $650 USD, it isn't expensive enough to warrant a premium display? (Like the iPhone SE https://www.apple.com/iphone-se/)
If so, I wish there was a fancier "Pro" model with premium components. IIRC, I paid $1000 for my first iPad, it was the first super high-resolution one back in 2012. Perhaps there aren't enough customers who are sensitive to wasted screen real estate on an 8-inch device.. and FWIW I have noticed a constant stream of toddlers pacified by iPad Minis whenever I'm at Costco.