that 7:5 no not always & looking at the high end complicates things with class defining spells that were not shared around on every spell list. Back in 3.5 bard was a 2/3 caster to the 1:1 full caster wizard. at level 8 bard got 3rd level spells including an amazing version of glibness. That came alongside some first second third & 4th level wizard/cleric/druid spells. Some like speak with animals, & see invis the bard was getting later than others, other spells like scrying, remove curse, lesser geas, & others the bard was getting earlier. The full half & 2/3 caster split got more involved in exciting ways for the party though & those get into your other points IMO. Sometimes a level 7 cleric spell might be comparable to a 5th level bard spell, but the bard should also be getting solid class/archetype abilities so a level 3 ceric spell might be comperable to a level 3 bard spell insteadHonestly... I'd love to see a system where the different casters feel different without losing a great deal of power through the use of gulfs of power.
Wizard, Sorcerer: Full casters. Their spells range from level 1 to level 9.
Clerics, Druids: 3/4 casters. Their spells range from level 1 to level 7.
Bards: 1/2 casters. Their spells range from level 1 to level 5.
Warlocks: Same as they currently are.
But here's the catch: A level 7 Cleric spell, or level 5 Bard spell, is the same level of power as 9th level Wizard spells.
Instead of looking at an almost never cast spell that was sor/wiz9 & now more, the old cats grace & bull's strength are much better & more nuanced examples of spells that would have an impact in what should be a sizable plurality if not outright majority. As full casters sor/wiz/cleric/druid would get them at level 3 while the fractional casting paladin & ranger got them at level 10. That would free up the full caster from needing to cast them in groups still casting it in addition to allowing those classes to self cast it in groups where a full caster couldn't usually justify devoting that many slots to those spells.ins
What you're getting by spreading the spellcasting levels out like that is twofold.
1) "Spell Gaps". Because a Bard gets 2nd level spells around the same time a Wizard gets 3rd level spells, there's a big gap in the Bard Progression between when they get 1st level and 2nd level spells, making room for greater class feature design room in that space. Things like a more robust Inspiration/Music/Performance system to provide support and effects outside of spellcasting.
2) Less Resources. Because a Bard only gets up to 5th level spells, they'll have less available spell slots than a Wizard or Sorcerer will over the course of the day, making other systems and features more important to their overall three-pillar functionality.
The cost, however, is also two part:
1) You have to assign different levels to the spells you create for each class. Wish, or it's equivalent, now needs to be Sor/Wiz9, Cle/Dru7, Bard5. (I know Druids don't get Wish, I was just using it as an example of how it'd have to be broken out.)
2) Designing spells becomes more complex as you have to decide which classes should or shouldn't have them and whether or not different classes should get earlier access. Right now, for example, Druids gain Control Weather as an 8th level spell. Under this system they get 6th level and 7th level spells. Should it be pushed up in power to their final tier of casting or placed below the level range at which Wizards get it.
You also have to deal with some player confusion over how strong spells are and questions about why a Bard's 5th level spell is as strong as a Wizard's 9th level spell, though I also feel like that could be resolved fairly easily with 2-3 paragraphs of design rationale in the "Magic" section of the book.
It adds up over the course of a campaign though.The problem I see with a 3/4 is that the spell slot progression will be the same as a full caster until the few last level that arent played very much.
Then you cant give them Extra attack at 5th level, because they'll be better than a 1/2 caster, but cant give it later than 6th level, because there's a bunch of archetypes that gives Extra attack at 6th on a full caster chassis.
- Level 4: full caster=4 casting levels progression. 3/4 caster only 3 levels.
- Level5 : 3/4 caster=4 casting levels progression.
- Level 8: full caster=8 casting levels progression. 3/4 caster only 6 levels.
- Level 10: 3/4 caster=8 casting levels progression.
- Level 12: full caster=12 casting levels progression. 3/4 caster only 9 levels.
- Level 15: 3/4 caster=12 casting levels progression.
That has sizable impacts on available spell slots as well as what levels spells are gained