Is it possible to be well rounded in martial arts ( stand up striking and ground grappling" by training in one class?

like a jiujitsu class that incorperates striking,is that good enough? or do i need to do boxing or mauay thai on in a seperate class? if theres strikes in the jiujitsu classes, then are the strikes any good or not the best? (jab,hook,upper cut ect) also, whats the difference in dojos,and gyms? is one better then... show more like a jiujitsu class that incorperates striking,is that good enough? or do i need to do boxing or mauay thai on in a seperate class? if theres strikes in the jiujitsu classes, then are the strikes any good or not the best? (jab,hook,upper cut ect) also, whats the difference in dojos,and gyms? is one better then the other?which has better training and more "brutal"techniques?
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