"But for someone just discovering the game it’s an important concept that they’re completely..."
You really want to help the new players?
Most of these dumb interface changes aren't the answer.
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Give us the TAB function that we been asking for since the start.
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Give detailed match history. This is one of the most educational things for new players in LoL, and it would be no different here. Match download, also, must be added.
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Champion Tile Colour by VALUE (Tier) probably made sense when the game was introduced. Changing Tile Colour to indicate trait makes a lot more sense now.
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Champion Percentage Drop Rate is a static value (for all matches, I mean; yes of course it changes by level, that's what level means), and it has no place as part of permanent dashboard real estate. There is no similar information that is permanently there. UNLESS you plan on introducing some mechanic that will change this value (even for the same level), then logically, it should be removed (and maybe replaced with a tooltip).