In free roam Roman and other people called you all the time and if you said no they would get mad and take away perks. How is that fun?
Roman did call you on the missions but it was scripted based on the mission. Niko automatically said no. It adds a touch of a game thats alive and its a nice detail.
I like a slow paced game better than a game that starts with over the top missions ex. COD, BF. I like to get to know the city first, the people, background, story, it all adds to the climax
They may have made more money but its certainly not as good as it could've been.
You would gain the perks after you did a couple of actvities with them. They don't take them away after you have them. And at least it's better than V, were they don't give you anything.
In V it is just an extra if you want more insight into the story as it should be. I knew people were going to backlash against V but I never thought people would actually want annoying calls back when even people who loved IV hated them.