There is plenty of doubt about the Estonian voting system [1]. It would be an extremely bad idea to use it in a country with more international influence.
[1] https://en.wikipedia.org/wiki/Electronic_voting_in_Estonia
[1] https://en.wikipedia.org/wiki/Electronic_voting_in_Estonia
But the rest is very useful. During last elections, one of the opposition parties I’m not a fan of finally got their act together and put actual pressure on the electoral committee rather than ludicrous nonsense: procedural issues, hygiene etc. That’s great! Very much appreciated. When the op sais we don’t have doubts he probably means we don’t have doubts about there being sufficient process to keep this thing getting better
That doesn't matter. The system is dependent on people's trust in the system. Sooner or later that trust will be eroded, you might hear convincing reports of external influence, people might be duped by a persuasive authoritarian candidate, it doesn't really matter.
Fear, uncertainty and doubt are enough for the system to lose legitimacy and spreading FUD about things people don't really understand is really easy, history is filled with examples of this.