>> An important consideration for consumers is that their data is secure if they lose their phone
> Well, it's a good thing that PureOS is LUKS-encrypted by default then.
My bad, I meant leave their phone unattended. Wherein someone can compromise the device from boot, so that when unlocked, the device is fully compromised.
You don't have to lock things down to solve that either - see the measured boot process with Librem Key for an example.
(that said, this is a completely different threat vector that I doubt the common masses actually care about; and if I really had to choose between openness and evil-maid resistance, I'd choose the former)