You consider it a regression, but since it's clear you haven't read this entire thread, here's an executive summary:
Glass can be made strong and ultra scratch-resistant, but that makes it brittle and prone to break when impacted or dropped.
Glass can be made more flexible and less likely to crack and break if dropped, but that makes it somewhat softer and easier to scratch.
It's an inverse continuum; you can't have highly scratch-resistant and strong, though Ceramic Shield is one of the best attempts to date.
The smartphone industry as a whole moved to formulations that are more flexible and less likely to break but are more scratch prone a few years ago, in part because people didn't like having to pay $300 or more to replace a screen when they dropped their phone.
In addition, scratches can be prevented by adding a $30 or so screen protector to the surface of your phone.
No such addition can be made to prevent cracks and breakage regardless of whether you use a case.
Different companies handle this situation differently.
Samsung ships their Galaxy S20 and S21 phones with a screen protector pre-applied at the factory.
Apple prefers not to and to let you, the customer, decide which screen protector would best work for you rather than increase the price of the phone to make up for applying one at the factory.
You hate screen protectors? That's fine - if you buy something like the aforementioned Samsungs, you will have to remove the factory-applied screen protector yourself, after which you will have a display that is just as scratch-prone as the iPhone's.
No one still makes phones with the harder, more brittle glass anymore.
Ultimately it's your choice, so choose wisely.