This would only create more issues. Reworking a job from the ground up, even from its weapon choice would mean alienating the players who are already accustomed to the job's gameplay and aesthetic. This is also just unnecessary in general. Also you realize Summoners (and Scholar even) use spell books, right? not ordinary books because they're mages? What is your point exactly?
Both jobs at this point are separate from one another. Summoner hasn't been a heavily DoT-based DPS since Stormblood, even more so now in Shadowbringers. Literally the only thing the two jobs share (that they both do use) is Resurrection and Ruin II. Anyway, it's not broken so it doesn't need needless fixing.
