Democracy requires transparency about how decisions are made, so that I could vote based on whether I support people's and parties' actions. E.g. if a law is proposed in German parliament it's pretty much open information who introduced it, who objected with what arguments, who supported it with what arguments etc. Either I am missing something or EU structures are much less transparent

https://www.europarl.europa.eu/legislative-train/ and other similar links.

There is vast amount of transparency available online, even in real time. Certainly who proposes what, which party groups vote for what etc.

Its not perfect but you original comment way of the mark.

It is the iron law of oligarchy.