2.1% to 2.9% is a 40% increase in breakage.
And a 40% increase in breakage is still quite large... Either it’s a more brittle glass, a worse mounting scheme, or a combination of both. But it’s much to large an increase to just be random noise, especially over 4 months.
The glass and/or design simply isn’t as strong as previous versions. It’s a step backwards. The screen breaks more often, and the back can now shatter (something never an issue in previous models).
Interesting this is proclaimed as FUD by the pro-Apple camp, however...