You would always find shooters that are simply not ready to accept the utility of a rifle scope for the type of hunting they specialize in. But this sort of blinkered notion only exposes their lack of knowledge of advances made by cutting edge optics and the enormous help they provide to hunters in ensuring a correct hit.
However, this does not mean that conventional iron sights or peep sights have become completely useless; rather, they are very useful in certain specific situations and no shooter worth their salt would ever deny this. But such an aversion to optics might arise from using either low quality lenses or improperly mounted rifle scopes sometime in the past and does not actually gel with the practical benefit of using a scope. If a shooter uses a rifle scope that has adequate magnification and is properly mounted and zeroed and suits their requirement in the type of hunting they specialize in, there should not be any reason for this allergy towards riflescopes.
Now let us shift from generalizations to the very specific topic of hunting wild boars. Generally wild boar hunting is done at ranges that vary between 100-150 yards and might be termed as short to medium. This is so because wild boars are generally found in terrains that have thick cover of undergrowth and bushes and a shot can rarely be aimed at a distance of more than 100 yards. This gives an additional benefit to the hunter. They can use the same rifle and the same hunting scope for shooting deer too.
The most common error in choosing a hunting scope for shooting wild boar is to pick up a rifle scope that has more magnification than required. Shooters usually make the common mistake of assuming that the larger the magnification the better would be the aim, but this is not always the case. Rather, a magnification of higher level ends up in only making the hunter poorer by a few dollars instead of adding any real value to the accuracy of the shot. A hunting scope with smaller magnification would also be lighter and easier to manipulate and handle than a bulkier one. So, it would be sound decision to first decide the degree of magnification actually required in short to medium range hunting and choose a hunting scope that has just adequate magnification. There is one other practical reason for choosing a hunting scope with just adequate magnification and that is a wild boar at 100-150 yards range is a sufficiently large target if viewed through a 4X hunting scope, any larger magnification may actually lead to a miss as the target would become so intricately magnified that the hunter may lose notion of the perspective and end up hitting at a wrong place on the target.
So, a hunter should choose a hunting scope that suits their style of hunting best instead of getting carried away by fancy magnifications and outlandish gadgetry.