The positionals are one of the aspects of playing a melee dps that makes it fun. Some people like thinking about creative ways to stay within boss attack range and adjusting for the boss turning, and tanking is also more fun because you can think of ways to make it so that the boss turns as little as possible.

That being said, I wouldn't be opposed to a melee dps that doesn't have positionals since I'll always be an advocate for offering a healthy range of jobs with varying degrees of difficulty to optimize. coughs in Shadowbringers Healer changes