Most studios use multiple speakers for points of reference, a near field and far field arrangement. There are many reasons; some may be mixing preference, some studio are not as acoustically neutral as they should be, mixers want to know what their music will sound like on smaller and large systems.
Hi-end colored fullrange speakers are usually not used because that is part of what happened to many recordings in the 60's to 1980's. Some monitors were bass reflex and were used near walls, and the bass resulted in many 'engineers' EQing the bass down in their recordings and the warmth of the speaker made them boost the high mids. Typically a good studio wants the most honest reproduction affordable within reason.
Hi-end colored fullrange speakers are usually not used because that is part of what happened to many recordings in the 60's to 1980's. Some monitors were bass reflex and were used near walls, and the bass resulted in many 'engineers' EQing the bass down in their recordings and the warmth of the speaker made them boost the high mids. Typically a good studio wants the most honest reproduction affordable within reason.