They are meant to bring certain core elements (thematically and mechanically) of each job to the forefront visually, not eliminate the need to look at the buff bars.
Not sure where people got the idea it was going to eliminate that aspect of gameplay.
Bard for example - songs and their respective procs/effects are a big part of the job now, so the guage acts as a clear indicator of the parts of the job that connect to the songs, rather than replacing the need to look at hotbar procs and the buff bar entirely.
