Sorry, but no, that’s not the problem. It’s their mission. Purism of course knows that currently their main audience is techy people. Like themselves. I’d say non-tech people are a long-term goal, but not the current main focus. It’s funny how people take the same facts to prove opposing points. Others suggested that the Librem 5 will fail because it targets a nerdy niche and not mainstream.
Of course it’s sad that there are no Ethernet ports on (most) Librems. But you cannot just take a random fact to prove a random theory. How about they are small, hardware design is complicated, there are so many wishes customers have and it’s hard to make everybody happy? And, I have to say… Qubes users that think Ethernet-over-USB is potentially less safe than plain Ethernet unless that USB is separated from all other USB devices, that is really a special kind of tinfoil users. A niche of the niche. If they target you specifically, they’re bankrupt before I get my Librem 5 
Give them time to grow and maybe one day the Ethernet port will be back in some of the models.
We got very off-topic here.