It glosses over the issue of microcode at the expense of security which ultimately affects privacy.
I'm pretty sure the FSF doesn't say that you shouldn't be allowed to update/changed the firmware. They just say it shouldn't be a part of the operating system. The OS needs to be entirely libre with no compromises.
It would be smarter to focus on arm and risc-v as many of those chips are compatible with free software in some way while being highly efficient and portable.
Most devices with those chips require a custom kernel and most likely proprietary firmware (at least for WiFi and Bluetooth). I don't think you can install an official Debian build from debian.org on a Raspberry PI for example (on RPI 4 you could by using some custom BIOS, but I'm not sure if everything will work then - https://wiki.debian.org/RaspberryPi4). Almost nobody talks about this, though. I have a PinePhone and it runs a custom kernel maintained by the community and its future is uncertain (https://blog.mobian.org/posts/2023/09/30/paperweight-dilemma/). In PinePhone Pro at lot of the patches to the Linux kernel have been upstreamed, but some things are still missing. Librem 5 developers tried to get a RYF certificate, but I'm not sure what happened there. So those kinds of devices can't save us right now.