But that‘s intentional. Former FHs are practically identical in law to universities. They all have the right to promotion, their masters and bachelors are legally identical to universities‘ masters and bachelors.
There's a very clear distinction between FHs and Universities. Not necessarily in reputation or level of education, but they are separated entities. And you cannot get a PhD from an FH.
In short, bachelors and masters are indeed legally identical to the ones acquired at universities, but most do not have the right to promotion. This mostly depends on the state they're in. And they are not allowed to call themselves "Universität" (though some have rebranded to "Hochschule").
All FHs that I know do have an option for getting a Phd through them, but they themselves can't grant them. Instead, an FH can cooperate with an Universität through a sort of loophole. The Phd students spend their time at the FH, but they have two supervisors and get their Phd from the "Universität".
But it seems like it is only a matter of time until difference, too, is no more.
The RWTH in Germany still uses Hochschule, but does add University now to their name.
And if you don't trust Wikipedia, the RWTH refers to itself as an "Universität", see here for example: https://www.rwth-aachen.de/cms/root/Die-RWTH/Aktuell/Hochsch... Doing so would be illegal if they weren't one, so I don't see where the claim that they're not comes from.
(Slide 9, for example).
Edit: you are right that the difference might not always apply, but they are not always identical by default as far as I understand it.
Universities of applied sciences are governed under the "Fachhochschulgesetz"[1] (Universities of Applied Sciences Law) while universities are governed under the "Universitätsgesetz"[2] (Universities Law). This carries loads of differences with it, i.e. when it comes to academic freedom and right to promotion. Professors at universities of applied sciences are much more limited in their academic freedom and these institutions do not possess the right to promotion at all.
Not sure where you got your information as it's wildly untrue in some respects.
[1] https://ris.bka.gv.at/GeltendeFassung.wxe?Abfrage=Bundesnorm...
[2] https://ris.bka.gv.at/GeltendeFassung.wxe?Abfrage=Bundesnorm...
Enough harassment for tonight?