Why is Riot concerned with new players?

Competition and New Players | Riot Pls - League of Legends
Lead Producer New001 returns with updates on the state of the game and the upcoming release of Clash, as well as plans to (finally) improve the new player experience, and some details on Ranked in 2019.
League of Legends is an old game, it peeked a few years ago and has been dwindling since. With that in mind, why on Earth is Riot concerned about *new player experiences* ??? If anything Riots primary focus should be RETAINING its current player-base, and rebuilding it from there. League used to pull in new players super easily, then Riot flipped the game on it's head and are now trying to figure new ways to pull in players??? The old method was totally fine/successful and is the reason League blew up the way it did. Even if you net some new players, they will inevitably become old players and you'll be back at square 1 trying to retain your player base. Create a sustainable game THEN open the gates to new players.
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We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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