I agree with your general point but there's nothing inherently bad about the smartphones themselves. They are perfectly good computers, it's these big corporations who turn them into locked down approved content consumption machines. We shouldn't be dismissing these computers just because of that, we should be working to empower ourselves to use them to the fullest with projects like postmarketOS.

I'm waiting for the new Pixel to come out so I can buy it and run grapheneOS on it. Then I'll try to port postmarketOS to my current phone.