It should be the opposite, I am a bit confused about LineageOS' statement here. The Quarterly releases represent solid milestones towards the final Android number milestone.
GrapheneOS claims that this made their rebasing much more efficient: instead of receiving a massive dump of all Android 15 at the end, developers receive incremental changes (the QPRs) to help them anticipate major changes in the code.
GrapheneOS claims that this made their rebasing much more efficient: instead of receiving a massive dump of all Android 15 at the end, developers receive incremental changes (the QPRs) to help them anticipate major changes in the code.