Though I think you have a point & it would be fine if the foundation selected a partner laptop manufacturer who has full hardware support by Freebsd, ...
It would be nice. For example, you can buy laptops with Linux pre-installed from both Lenovo and Dell (and I presume many smaller companies too), and that includes support: if something breaks (like you do an official update of the OS and X doesn't display correctly), you call them on the phone, and can expect some help. (Yes, I know support is not great in general, but at least it's something).
But consider this: Linux is a tiny share of the desktop market (probably around 1...2%), and FreeBSD is at least one or two orders of magnitude below that. If for example Lenovo started offering laptops with FreeBSD pre-installed and supported, they would probably sell hundreds of them (please look at the internet meme "there are dozens of us", it's funny). That's definitely not worth the effort for them; it would take many months to set this up, create the part numbers, write the playbooks for support, do all the legal work to get the licenses squared away, train support people, and so on. At a profit of maybe $10...100 per laptop, this is a ridiculous proposition.
hopefully enjoining them to help with device support.
Warning: This is about english style, not content: The verb "to enjoin" is usually used in legal speak, in the sense of "to force someone to do something using an injunction". To enjoin someone has become quite a nasty thing to do. I don't think you mean that. What would be good if the FreeBSD foundation joined the vendor to help with device support, and there I agree with you.
Here is something that could work, if the FreeBSD foundation were interested in furthering desktop use: select a reference hardware platform (for example Lenovo model ABC or Dell model XYZ), publicize that on the web site, and work just a tiny bit with the vendor (for example making sure that the model number is written correctly, and link to the correct page where one an order that specific hardware from the vendor). This would requires only minimal work on the part of the vendor, and it might already help a little bit.