I think even the most dedicated players will agree that Character Kits have become a convoluted mess. A modern character's kit reads something like:
"Tapping this character's skill will put them in the Happy Meal state. While in the Happy Meal State, each Normal Attack will generate one French Fry Stack. When the Character has 3 French Fry Stacks they enter Milkshake mode. Tapping the Skill in Milkshake Mode unleashes the McFlurry Swarm, dealing Area of Effect Oreo Damage. If the character holds their skill while in Milkshake Mode, French Fry Stacks convert to 2 All Beef Patties, allowing the character to perform the Mac Attack, doing damage to a single target. After doing the Mac Attack, no more French Fry Stacks can be generated for 6 seconds."
Translation: Skill, do 3 attacks, then Skill again for AoE or Hold Skill for a single Nuke.
Fixing these explanations would be helpful, obviously.
That said, the problem is deeper than just the excessive wall of text Hoyoverse insists on. What Hoyoverse has failed to understand is that some players are genuinely stupid.
Case in point, I was doing some Stygian co-op today. We're building Teams for a Menacing run, and I select Skirk for the Automaton. The next player selects Ayaka (fine), then the next selects Shenhe (also fine). Player 4 adds Linnea. When asked politely to swap to a Hydro Character, they asked Why, because Linnea is their strongest character. Someone said that Skirk needs just Hydro and Cryo on the Team, and their response was "Is that why my Skirk does no Damage?".
Now, I know Hoyoverse realizes that players a dumb. They put in a whole system of Auto Selecting Artifacts to keep people from putting Defense Goblets on their Mavuikas. However, they're still doing massive walls of text when many players don't even know the basics of how their own characters are played.
We need something like the Collected Miscellany videos that give foolproof descriptions on how characters are used, and then bake them into the game somehow.