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They're not fully abandoning turn-based from the mainline titles when it's the most accessible form of gameplay for new players, and especially people who've never played a videogame with more complexity than "tap your screen to win."
They have to have SOME point of comfortable exposure for new players to understand how the fuck the bare basics of Champions' gameplay will work in a newbie-friendly environment that doesn't expect them to worry about things like stat distribution, actual strategic movesets, abilities, held items, hell, even types outside of the basic rock paper scissors formula, or any of that shit they need to be eased into.
For Gen 10 you'll see turn-based as the primary, mostly against fellow trainers and boss Pokemon, while a shittier version of real-time will be relegated to an expansion of the Let's Go! and Synchro Machine mechanics from SV, which can be used as an alternative means for battling wild Pokemon, especially for Shiny/Mark hunters.
Remember, dipshits, Gen 10 and LZA were developed concurrently. This means key features from LZA will either be half-assed or completely absent from Gen 10, just like how features from PLA were half-assed or completely absent from SV (actual variable AI behaviors for Wild Pokemon, the chime that plays when a Shiny spawns, etc.) because those games were ALSO developed concurrently.