The reason for the delay as mentioned previously as well is that an OS upgrade does not happen through OTA builds. Even Lineage does not provide this ability in fact the stock updater prevents such upgrades. Since /e/ is a fork of Lineage we have the same issue. A good number of our users would not be comfortable with manually flashing the ROM to upgrade. This has been the reason why we have dragged the OTA upgrade for such a long time.
Having said that the build team is working on this issue to find a resolution.
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