Rune suggestions
Below is a list personal brainstorms I've had to make some of the runes feel a bit more balanced and/or intuitive. Feel free to add on.
Precision Tree
-Press the Attack: I think we can all agree the lane damage and pressure this brings is quite annoying. Increasing the exposure damage, and removing the proc damage would be a good edit to this keystone. -Fleet Footwork: Speed boost is really nice, but it feels like the heal isn't even there. I understand it being low early, as not to sustain your opponent out of lane. But there's no reason the base heal is 50 at max level, with a very minimal scaling. A simple stat boost on later healing would improve it's utility. -Triumph: I don't think this is actually problematic, but an overtime (3s maybe) heal instead of instant might feel a little better for those times you ignite someone with 20 hp before you die, but they still live.
Domination Tree
-Predator: Very high cooldown, very low damage. The speed boost would be great, if any source of damage didn't stop it entirely - including the minuscule damage that comes with it. Needs QOL changes on speed boost, and either a lower CD or better damage. -Malice Branch: If I'm being honest, I see no reason to take Cheap Shot or Taste of Blood unless you literally cannot use Sudden Impact. I suggest improving Cheap Shot and Taste of Blood, or slightly lowering the stats on Sudden impact. As to make the other two options seem attractive, even to one who can leap/stealth/etc. -Hunter Branch: No actual suggestion, but I want to compliment the devs on the amazing feel to all 3 of these. The hunter runes feel intuitive, impactful and fun to use.
Sorcery Tree
-Summon Aery: So abusive for a utility spell. Lower early game damage, and maybe slower return speed early game might make it feel a little less annoying. Atm, it almost feels like it does Arcane Comet's job and more reliably. -Phase Rush: A 3 hit passive, hard to proc for most people who would benefit most from this (A.Sol is a prime example), and a shockingly low speed boost. Should be something like "x second(s) after damaging a champion gain x speed and slow resistance if melee, for x seconds. Procs automatically after getting a takedown." -Artifact Branch: Again, no real suggestion. Just appreciating how fun this branch is to use. -Celerity: Maybe this is just me, but I'm having a hard time getting to use this over Transcendence or Absolute Focus. As Evelynn with over 600 out of combat ms, this was only giving me around 20 AP. I think instead of a % increase, it should be something like "Gain x ap or x ad for every 1 bonus movespeed" (Something small obviously). -Scorch: Once again, maybe it's just me, but this feels nearly useless. Tried it on many character's, and can't seem to get it to be useful. Pitiful base damage, no scaling and it's magic damage so it can still be resisted. I'd suggest making it true damage, giving a simple stat boost, or having a significantly lower CD.
Resolve Tree
-Keystones: Appreciation once again for the amazing and intuitive play styles each of these offer. Aftershock might give too much of both offense and defensive uses, though. -Font of Life: Small, ever so small heal increase please. -Resistance Branch: I'm having a real issue with how weak Mirror Shell and Iron skin are compared to Conditioning. Most champions who would be buying defensive items, don't start till after 10 minutes anyway. So you get more armor and MR with Conditioning for waiting, even though you wait anyway? While Mirror Shell and Iron skins are just copies of one another, with their stats given being the exception. Obviously you shouldn't have more armor/MR than conditioning if you get it immediately, but only a 5% increase that's not even permanent? Really? I think Conditioning is fine, as is, but Mirror Shell and Iron Skin really need looked at.
Inspiration Tree
Honestly, I haven't played around with it enough to have an opinion yet. Kleptomancy seems a bit annoying on GP and Ezreal, though.
Thanks for reading if you got this far! Hope you enjoyed. I'd love to hear your thoughts on my suggestions, and those of your own. :)