The missing piece is context. An isolated matchup page cannot account for both team compositions, who can start fights, which damage type is overloaded or where your champion fits in the five-player plan. Change one pick and the useful advice can change with it.
Contextual coaching begins with that lobby. Baron Buff can update draft recommendations as champions are locked and turn the completed matchup into a short game plan. Instead of asking the player to combine several guide pages mentally, it filters the information around the match that is about to start.
That does not make static guides obsolete. They are still the better place to learn a champion’s fundamentals in depth. Contextual coaching serves a narrower job: applying those fundamentals to the allies and opponents in front of you.