first of all: hats off - trisquel is one fine distro on a lenovo x60s and other lenovos it will just run very well.
yes - the free open source libre drivers only concept will drive a lot of people nuts because their wifi and other network related stuff will not work. but if you can not trust your network card - what can you trust? (will have to use a usb wifi dongle from http://libre.thinkpenguin.com if you want it on a newer lenovo... but then there will probably be more chips you can not trust, it is really time for free open source hardware designs... RISC-V based laptop, where are you?) you can build your own for around units 250 of your official currency. My Guide to free as possible do it yourself a libreBooted laptop: https://dwaves.org/2019/07/15/guide-for-as-free-as-possible-laptop-libreboot-x60s-atheros-wifi-trisquel/ core 2 duo is still reasonably fast if you also install a ssd also: if you are concerned about privacy you SHOULD tunnel ALL traffic (ALL! Including DNS queries) over tor and disable javascript. so where is the guide to how to build your all-onion-router that does that? buy more of those instead of raspberries and hope that it happens soon! https://www.crowdsupply.com/sifive/hifive1-rev-b (no they are not yet full desktop replacements... people are working on a "Libre VGA card" but it's a lot of work)
