When you have a 10lb block and need to machine 90% away they can have a significant advantage. It really depends on type of rougher and depth of cut. Imo if you aren’t taking deep enough docs to get into the chipbreakers then they’re really isn’t a point compared to a normal variable flute. Lets say you are dropping down 0.500 doing adaptive, thats where they really shine because you won’t have 1/2 long chip shards everywhere, they tend to break into squarish chips.
They also use less force to cut but most of us aren’t power limited anyway. So that’s a yes if you cut more aggressive than normal and want better chip management. Also most roughers will have a radius or chamfered corner which makes them very chip resistant.
You can have a variable flute endmill that isn’t a rougher. Lakeshorecarbide has all the options and they are very good at helping when emailed questions.