Yes, the price is high, but I feel that Sliger is honestly doing a great service to the SFF market with this line-up.
I hope my comment wasn't taken in the wrong way, I absolutely agree 100% with you that Sliger is doing God's work here and trying to please as many people as possible with this line up of cases. It's awesome to participate and see it evolve, and I've been showing this thread to a lot of friends who are super excited by the case. Looking at the builds hitting the front page of the SFFPC subreddit shows that lots of other people are interested too, and that's awesome!
For my particular use case (10GbE as you suspected), I agree its hard to find something that fits, except maybe something super awkward like the Maximum XI Gene in the NCASE M1 (which has its own long list of problems). I'm hoping there will be AM4 mITX boards with >1GbE options this summer, but if that fails then this (as you correctly pointed out) is one of the few, if not only, good options out there, and huge Kudos to Sliger for his work on making all this happen!