I do not want to dampen the euphoria and am the last person to be against improved protection.
However, it is unfortunately not quite so trivial with either RC2 or RC3.
Even if the quality, shape, and number of fittings should be increased, the design is also decisive. For example, windows with a mullion have certain disadvantages in terms of security.
Above all, the metal profiles in the window frame are important.
DIY store windows have none at all.
Window manufacturers do install some, but these are more designed for dimensional stability and are no thicker than a sheet of metal.
That means under force, even the best fittings may find no hold in the frame.
It is similar with the glass; if the sash profile is not reinforced, it is unfortunately a false sense of security.
There are some certified window manufacturers in DE who can offer RC2, but not quite as many who are certified for RC3, and even fewer who offer RC3 in plastic.
The requirements are simple: burglary tools and the time are specified.
For RC2, 3 minutes, and for RC3, 5 minutes, and these can be very long.
Therefore, some manufacturers already glue the glass in at RC2 to pass the test.
Simply google "K-Einbruch" and, for new construction, look at the police manufacturers directory. There, the German window manufacturers, as well as the certified design and materials used, are listed.