Personal development and spiritual development are not the same thing. In personal development there is a lot of ‘I’ and a lot of ‘ego’. By contrast, in spirituality, the goal is to abolish the ‘I’ or ‘ego’ completely. For a spiritual aspirant, that which you may call ‘personal development’, is just the manifestations of his/her spiritual growth, reflected back on the physical and psychic spheres.
Regarding the topic of ‘personal development’, I shall only say that: if your priority is only in obtaining psychic adjustment with your psycho-physical circumstances, then yes, you should pursue it.