At first, I thought this one is a good start for isekai manga. But now that I think more deeply, does MC need to be a job changer? Author can just slap him with access to all skills, it still the same.
From what i know, in RPG like story, every job related to stats & specific skills, not to mention pros & cons. Stat build for mage is different with thief, melee build vs range build, etc. Not to mention character progression with skill points. Now that MC has chosen to invest in Mage with fire ball skill, how does he change to another job? Does he get a skill/stat reset every change?
Unless MC has max stat points like Momonga, he is practically useless with starting just high base of MP.