I can clearly confirm the assessment that this has improved document security.
As I mentioned before, ID cards and German passports already had high document security. However, there have been trials to tamper with them or manipulate them and they were more or less successful, but in few numbers. But with this additional dimension and technical solution, for the time being it appears—let me put it that way—impossible to alter or manipulate German or European passports that follow the same document security.
This passport allows, really, the one-to-one check of the person at the border post. If it is supported by modern software, you can also exclude that look-alikes can actually use passports. This additional layer of security is really worth the effort.