It's never really been about electing those with expertise, either in issues or in how government works. The civil service, at least in the UK, cover the latter, and you bring in specialists and experts to cover the former.Olga, we don't elect random people. The whole point of representative democracy is choosing people who do have the expertise in issues and how government works and creates policies. We don't have a referendum democracy, where every issue is voted on. That would be crazy, for a large nation.
What we elect is really just a matter of personality in someone who claims to share the same values as you. Ideally you elect someone with passion and drive to make the changes you want to see, and someone capable of achieving it by having the right team around then.
In some countries the personality matters more. The more money there is in politics the more you're likely to get people with the right personality and drive and competence/team, but too much money and you get corruption. In the UK we have so little money and so our politicians tend to be the most boring people you can get. I don't mind that, personally, as it means you can focus on policies. But it's got to the point where I couldn't confidently name anyone in government other than out PM. I might know a few other names, but not necessarily the dept they are minister of.