Hello, and welcome to the forum! :)
1.If you want a FSF-endorsed GNU/Linux distro based on Debian, you can see
for gNewSense: gnewsense.org
Ubuntu LTS also has 5 years of support.
The Trisquel main goal isn't be steps ahead in technology. Instead, is to
provide a fully free operating system easy to install and use.
2.I am agree with you, there are other things to do:
https://listas.trisquel.info/pipermail/trisquel-devel/2016-November/001024.html
3.This is 50% true. Now, the FSF support Coreboot, a free BIOS but it
contains binary blobs. The goal is to make devices compatible with Coreboot
without these blobs. There's a project that provides a 100% free BIOS:
libreboot.org
Also, you can use Debian with only "main" enabled. in h-node.org you can see
you can use Debian for testing hardware.
