All better players than Digne.
It's normal to try out different players in the conference league for big nations. Would surprise me to see Digne start in a major tournament.
Agreed but left back is a niche position and it's very likely they don't have many good options at this moment in time.
And considering Digne is their best option I think that is very likely the case. Throw me some names and I doubt I've even heard about them.
What are their alternatives?
Just because you play for your country doesn't automatically make you a top player. The generation of players in that particular position may just be shit right now
Olsen starts for Sweden. That makes him a good player?