I think a distinction needs to be made between systems where military leaders were elected by the whole polity, such as in the case of Republican Rome and Athens, and systems where soldiers elect their own superior officer.
All of the problems you mention would be significantly greater problems with elected officers. Promotion by merit at least means there are criteria by which performance is being measured. Now if the criteria are not being followed, or if the criteria chosen is not effective that's not a function of function. It's a failure of design.That is the idea, but plenty of professional militaries, not least today's US Army shows that this idea of 'promoting on merit' does not mean more competent officers necessarily. You simply get structures of patronage, cliques and popularity contests within the military which then leads to people getting promoted based on their ability to play internal politics.
I think your answer, without attacking you, would be what a member of a professional military caste would claim as a defense against more democracy and against threats to his way of life.
I believe the Mongols did something like this.How common, historically speaking, has the direct election of military officers by soldiers (or other forms of military democracy) been? Are there any examples of this from ancient history in addition to more commonly known anarchist experiments?
If you go to tribal or early feudal structures, all leaders are elected.I believe the Mongols did something like this.
Not to forget that it's largely a "promotion on seniority" system anyway. Serve X years in rank, have done Y and Z, have qualifications A, B, C, move on to next level.That is the idea, but plenty of professional militaries, not least today's US Army shows that this idea of 'promoting on merit' does not mean more competent officers necessarily.
Eh. Let's not get carried away. The International Brigades were small formations, conspicuous in the media, that played a high-profile role in a losing war and which were primarily characterized by high morale. They suffered disproportionately high casualties, and the battles they fought in were usually defeats. They weren't exactly the Taman Guards.I am dubious about that.
The International Brigades used to elect their own officers and of the many sins attributed to them military inefficiency was not one.