Very well done compilation, Maximuuus. Just to support the part where you discuss the advantage system (which for me is the most cancerous rule of the game regarding balance) let me share my list of the special conditions that they’ve nerfed & spells that can cause that.
Attack rolls made by a blinded creature have disadvantage. (Deafness / Blind, blinding smite, color spray, contagion, divine word, holy aura/weapon, sunbeam, sunburst)
Attack rolls against a blinded target have advantage. (Deafness / Blind, blinding smite, color spray, contagion, divine word, holy aura/weapon, sunbeam, sunburst)
Attack rolls against an invisible target have disadvantage. (invisibility & greater invisibility)
Attack rolls made by an invisible creature have advantage. (invisibility & greater invisibility)
Attack rolls against a paralyzed target have advantage. (Hold Person)
Attack rolls against a petrified target have advantage. (Flesh to Stone)
Attack rolls and ability checks made by a poisoned creature have disadvantage. (ray of sickness)
Attack rolls against a prone target have advantage if the attacker is within 5 feet, or disadvantage otherwise. (Tashas hideous laughter, Destructive wave, earthquake, sleet storm, thunderous smite, Grease, etc)
Attack rolls made by a prone creature have disadvantage.(Destructive wave, earthquake, sleet storm, thunderous smite, Grease, etc)
Attack rolls against a restrained target have advantage.(Poor Grapple :()
Attack rolls and Dexterity saving throws made by a restrained creature have disadvantage.(Ensnaring Strike, Entangle, Mental Prison, Telekinesis, Web, Whirlwind, Transmute Rock, Snare, and many more)
Attack rolls against a stunned target have advantage. (Stunning strike – Monk, Contagion, Divine Word, Psychic Scream, Symbol)
Attack rolls against an unconscious target have advantage. (Catnap, Eyebite, Sleep, Symbol)
A frightened creature has disadvantage on ability checks and attack rolls while the source of its fear is within line of sight. (Fear, Eyebite, Hallow, Illusionary Dragon, Phantasmal Killer, Symbol, Wrathful smite)
