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There are two families of KFX able Kindles. Older ones after PW1 that haven't had FW past 5.16 and newer ones that still get FW updates.
The azw3 only models are K3 to PW1.
It's also not really about DRM as such, but Amazon control. Some ebooks to even 2024 models will not be KFX.
Currently KFX is no harder than azw3 and I'm sceptical that will change for the older KFX models or that azw3 only models will be cut off.
OTOH they might only have ebooks from late 2025 or 1 year after last eink model sold (which might be later this year or 2026) be for current version app only. It would make sense from Amazon control POV. The DRM shenanigans are Amazon driven, not publisher driven.
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