Those who don’t have experience with slugs often under rate them. Several states had no rifle season, Ohio was slug only for years. Then Bow season, Muzzle loaders, handguns and now limited rifle. Minimum .38 cal , straight case only.
If I only hunted Ohio and had a good slug gun I wouldn’t run out to buy a rifle.
Yes, in some states a HV rifle with scope is useful where you can see long distances in open country. Ohio has some of that but in SE Ohio anything over 100yds is long shot. So slug is not really a disadvantage.
When Ohio first had a deer season in 1950s up through when deer herd got big enough to be a major sport, most hunters just used what ever they had. But if you ever hunted with a rifle a slug gun just don’t get it. They don’t make slug guns that handle like classic deer rifles.
Having said that the average smooth bore gun will do 6” at 100yds. A good one will do 3”. The interest in slugs has increased not by hunters, it’s the black gun and shooting games. They act like they have discovered something new.