Wanting to have our own devices doesn't mean that the campaign to have OEMs making a device we can use now is not still ongoing. If all the currently supported Pixels become end-of-life and all we have is devices we created, then all that has happened is we have moved the goalposts.
OEMs should be more open to allow users installing other operating systems and to support more hardware security features. They benefit from having us able to use their platform, just like we have reported numerous security vulnerabilities upstream to Google.
If a device manufacturer is making a device like this without us needing to pay them for a bespoke product, funding can go elsewhere which is good for us.