I don’t know if they make them anymore but I highly recommend it.
Laptops with Nvidia dGPUs are available from many/most other manufacturers, as you said, so there is no real reason to buy them from them. Especially if they offer sub-par Linux experience.
Their can't keep up with the demand on the laptop market. How old are their Zen 4 processors? There are barely laptops with them. We had to wait months for a real use benchmark because it was impossible to get them.
Right now if I see and AMD GPU I wouldn't even know if it's new gen or from 3 years ago.
They are not on the market mobile market.
Not that this is relevant for this laptop.
From experience, open-source drivers that are integrated into the kernel and open-source source user space have much better quality, better out-of-box experience, and push the whole ecosystem forward.
Compared to closed-source drivers, which often need to catch up to modern software, and are difficult to debug, they need additional steps to integrate and often have to build their own stuff instead of improving existing solutions that help everyone.
You will not get helpful support for errors in your proprietary driver from the manifacturer in most cases, while you get support and fixes from the open source community. It is much easier to isolate the issues if you can access the code.
(But you are right, maybe I should have formulated it better. I meant all Laptops with dGPU they offer are with a Nvidia dGPU.)