I agree mostly, with one comment-worthy exception...
Without doing the math, I'd guess that 3 + bonuses (Guild, Strength, etc) +30 from the Spell = 40. And most players want a total 40 jump, as there are several quests where anything less just doesn't get the job done.
And to have 40 innately, without having to worry about slotting a Jump item, or gear swapping - that's really nice. Really, really nice.
(Some players will want to get to 40 earlier than Level 9, so will chase +20 total before then, enjoy a 40 Jump early and not worry about having a 50+ total* later. Ymmv.)
(* @ New(er) Players: There is one exception to the "40" rule. If you're in Stealth (sneaking), you suffer -20 to Jump, but the "max" is still 40. So you then want a Stealth total of 60, so you can sneak-jump those 40-Jump spots. Plan ahead. )