I'm not ready to break completely from D&D, so yeah. What I like most about E6 is that it gives you a background world that makes sense--most people are never facing more than CR 1 challenges (at least not many), so you have exponentially fewer people at each level--50% 1st, 37.5% 2nd, about 10% 3rd, 2.5% 4+, if you're in a challenging environment (frontier or savage area, professionals with PC classes, expert smiths, etc). In a guild, 1st level is Apprentice Member, 2nd level Journeyman, 3rd level Guild Master. So while there may be a spellcaster in every village and a dozen in a good-sized town and hundreds or thousands in a metropolis, a 3rd or 4th level spellcaster is something special.
So 2nd level spells should be something special. If a spell doesn't tell the townsfolk "Wow, our Twilight Sparkle is a good wizard, but this Great And Powerful Trixie is AMAZING"--it's not a second level spell.
Likewise, if we have a 1st level spell that could be cast at-will without creating problems, why are we even requiring a spell slot? Make it a cantrip. You still know a limited number of cantrips, so taking Detect Evil/Good/Chaos/Law means you couldn't afford Touch of Fatigue or whatever.
I'm not saying I want stronger magic. I'm saying that a lot of spells were leveled in previous editions, or in the early days of 3rd, when the idea of a "warlock" with free blasting EVERY ROUND would have been unthinkable. I'm saying that a 1st level NPC or PC caster with animal messenger as a 1st level spell and speak with animals at will is not unbalanced compared to a caster with charm animal as a 1st level spell and daze at will.
It's a game of resource management, and I think that a lot of resources (mostly utility and situational magic) are overpriced by 2018 standards.
I went ahead last night and made lists
Cantrips
Animate Rope
Deathwatch
Detect Animals or Plants
Detect Evil/good/Law/Chaos
Detect Undead
Floating Disk
Hide from Animals
Hide from Undead
Ventriloquism
1st level spells
Animal Messenger
Animal Trance
Darkvision
Gentle Repose
Magic Mouth (maybe even a cantrip?)
Make Whole (but eliminate Mending cantrip)
Shatter
Shield Other
Spectral Hand
Status
Tree Shape
Undetectable Alignment
Warp Wood
Zone of Truth