So the certification definitely matters at least for new people who do not have time to read a ton of info about the certification and to reflect on that?
I think it would be already a big step to certify the bare Librem 5 device without external cards (WiFi and modem). People will still be free to buy them together and use Librem 5 as a phone, but the certification will definitely attract more enthusiasts.
For such cases, it helped me to show the Pinephone and explain that a more performant and better alternative (Librem 5) is on the way.