Are you suggesting that the trees become invisible in the wintertime?
Desperate. Very desperate. You're clinging to a sinking log. Even sans foliage they are still going to obstruct visibilty. Even more so at night. The simple fact is that the balcony is not as visible as the window, and that someone on a balcony would not be particularly out of place anyway, especially when viewed from a distance. Attempts to argue otherwise are rationalizations. They are not, however, rational.
Perhaps I'm mistaken, but I believe you are the one who broached the topic. I have no reason to expect that there is any substantive difference between the two as far as resisting the efforts of a determined burglar with no reluctance to do damage.
In general, double glazing will not offer any significantly greater protection from a B & E than single glazing. Its purpose is to be a thermal barrier, not a security barrier. At worst, a burglar would have to break it twice.
Bang! Smash. Tinkle, tinkle.
...
Bang! Smash. Tinkle, tinkle.
As far as I can tell we have no reason to expect that the patio door is anything other than a regular, garden variety installation. I'm interested in seeing your sources for residential patio doors with impregnable security glass. After that we can move on to the evidence you have that such a rare beast is actually installed at the apartment.