After the advent of constitutions, the margin that is associated with opinions was diminished since the administration must follow the principles and fundamental rights as a priority. The creation of legislation then could be proposed as a technical element according to the circumstances, where the opinions or inclinations in general don't necessarily need to exist to sustain an efficient administration and democracy.
There is a problem associated with the decisions of people when they are inserted in a specific group of action. Usually, very usually the group tends to promote decisions that directly favor the intrinsic conveniences. This means to break the principles of democracy when the representative parties forget that the system has much more citizens to consider than other aspects.
From another view, it's simply irrational to create hierarchies where the highest decision comes from people that was elected not by means of an exam of aptitude but for having specific character conditions at the personal level. Individuals with the idea of joining political parties is not correlated with the aptitude to acquire that level of responsibility. At the same time, it permits the easy access to relevant positions toward a definite profile that finds in politics a viable direction to fulfill high salary expectations or other economic benefits, popularity, recognition and trajectory. Also an open door to capitalist companies with lucrative purposes so unfair plans in term of legislation, corruption, sects, extremist ideologies or any other that doesn't fit with the prosperity of the society, the justice of equal opportunities and human rights.
It's also obvious that the political class and its prerogatives aren't economically optimized, with so many legal paths to assign public money to areas or create tax benefits that the democracy doesn't like. Although with the arrogation of power some groups decide by another form of force, after an act of democracy of choosing from a tiny set of options.
In any time, it's possible to create an administration elected by the people with aptitude exams from individuals with high personal development, work history and efficiency, and leaving aside opinions, manipulative promises and make up. A technical administration.
Like a University has an administration, with people that do the work. So the student —aka citizen— should trust it because it's presumably efficient and solves problems rationally.