Thanks for that! I'm currently looking to upgrade my unRaid server and this may be a very good option! Ok, so it only holds 4 drives, but on the other hand, that's about the amount of drives I have now as well and it seems you can very easily add external HD's to it via USB 3.2. (the link you provided to that ServeTheHome review was very informative and they mentioned that as well).
Indeed a bummer they didn't include an NVMe option, they should really slap their hardware architect for that. But I still think this server a good option nonetheless. I haven't found any review for unRaid on this Gen10+, but I 'm sure those will pop up soon. This server hasn't been released long and it seems it's hard to come by at the moment.