D&D General [+] For (hypothetical) 6e: Which arcane caster class should be the "simple" one?

[Horwath]

Simple Caster, nothing but cantrips, number known equal to prof, swap one on level up.

at least 2×prof bonus.
or
start with 3, damage scales at every odd level, new cantrip at every odd level. Total of 12 at 19th level

even levels are for feats and class features that additionally buff cantrips:

1st level: removal of spell components for cantrips
2nd level: +casting mod to damage
6th level: Fast casting: casting mod per Long rest(LR) to cast Action cantrips as Bonus action, +1 use on Short rest(SR)
10th level: concentrate on 2 cantrips at a time
18th level: cast mod per LR, +1 usage on SR: max damage on cantrips
20th level: improved Fast casting: 2×casting mod per day(+cast mod per SR):
Either 2 cantrips as an Action or 1 cantrip as Bonus action

 

[Minigiant]

Simple Caster, nothing but cantrips, number known equal to prof, swap one on level up.

I did faster than Sorceror cantrips.
Bonus damage dice at 2, 10, 13, and 17
2 cantrips a turn at level 5
3 cantrip a turn at 20
Reroll dices at 7 and 15
Cantrips crit on 19-20 on attacks or 1-2 on saves at 9

Level	Proficiencies	Class Feature	Cantrips
1	+2	Spellcasting, Defensive Forte	5
2	+2	Heightened Cantrip (1 die), Offensive Forte	5
3	+2	Arcanist Subclass	5
4	+2	Ability Score Improvement	6
5	+3	Dual Cantrip	6
6	+3	Arcanist Subclass,	6
7	+3	Empowered Cantrip (1 die)	6
8	+3	Ability Score Improvement	6
9	+4	Critical Cantrip	7
10	+4	Heightened Cantrip (2 die)	7
11	+4	Offensive Forte	7
12	+4	Ability Score Improvement	7
13	+5	Heightened Cantrip (3 die)	7
14	+5	Arcanist Subclass	7
15	+5	Empowered Cantrip (2 die)	8
16	+5	Ability Score Improvement	8
17	+6	Heightened Cantrip (3 die), Offensive Forte	8
18	+6	Arcanist Subclass	8
19	+6	Epic Boon	8
20	+6	Triple Cantrip	9

Simple pew pew and utility cantrips

 

[CleverNickName]

Put me down for Warlock.

• No multiple spell slots across multiple levels
• Automatic upcasting
• Small spell list
• Small list of spells known
• Spell slots recover after a short rest

 

[tetrasodium]

• d6 hit die
• Class specific abilities rather than spells copied from other classes (at will or limited charge based)
• Give it newbie friendly training wheels in the form of those abilities being con based
• extra attack or similar linked to class level rather than making it an irresistible dip with something character level based.
• Mostly blaster focused simple gish leanings
• It should be designed to ensure finding treasure is exciting. No opt out from wanting to find treasure. Either normal armor or weapons being needed and expected by the class

 

[Blue]

Put me down for Warlock.

• No multiple spell slots across multiple levels
• Automatic upcasting
• Small spell list
• Small list of spells known
• Spell slots recover after a short rest

I don't disagree, but I'm not wholehearted with you.

Complexity has a couple of niches, and what you say address both of them: character creation (and advancement) and at-the-table play.

That said, there's more to the Warlock then what you talk about. EB, unless you're going up the melee route, is such a spell tax that not taking it is a trap option. Warlock has both patron and pact instead of just a single subclass, and in some cases like hexblade and path of the blade how they interact is important enough that you need to know about future choices and plan advancement early. In addition you've got not just spells but invocations to both read over during character creation and to use during play.

I've seen newer players forget that their warlock slots upcast and just use the base spells. I've seen new players not consider upcasting when picking spells, and having spells that haven't scaled and they have a very slow replacement rate. More places where a player can get semi-locked into choices that looked good at the time, that a more experienced player would consider how they scaled as well. In other words, additional complexity.