I'm also an X1 owner; one of things that attracted me was the SFP (fiber) port. Seems like an obvious cheap and easy end-run around the electronic noise that may accompany ethernet connections.
I know there are lots of other avenues to pursue same objective, but I'm unconvinced that they are superior to the simplicity of a direct fiber path.
Knowing that nothing is forever, and that I'll eventually get an itch to upgrade what is my only source, I would very much like to stay fiber when I do.
Reading tea leaves, the X1 was introduced in 2018. That's nearing 5 years now. Lumin seems to be pretty aggressive about updating their hardware (if even just to solve their own component supply problems).
I don't think it too far a leap to speculate that it may be due for an upgrade (X2?) soon. Maybe? When they do, I'll certainly take notice.