You should consider why the hardware vendors are in the critical path for OS updates in the first place. Dell doesn't get to decide whether you can apply Windows updates.
They more or less intend to supply the hardware only. This avoids the pretence of vendor updates entirely, by both the company (Pine64) and the ARM licensee (Allwinner).
The software stack is up to you, with mainline Linux support courtesy of the A64 [0] powering a number of 'RPi-killer' boards. Device updates will be supplied by the likes of Ubuntu Touch, LineageOS, postMarketOS et alia mobile distributions.
Maybe. Except that for me (and I know I'm not alone) the second most important part of my pocket computer after web searching is the camera, and they're unlikely to have anything great in there.
> Allwinner
Hah. The repeat GPL violator?