It is a real router in terms of what it means in a standard consumer context (basically, it does DHCP & NAT).
It just doesn't have a lot of features power users are use to.
Personally I have a OpenWRT router/AP for my Dishy. Just waiting on a Dishy Dualie DC power supply to kick over to a DC only setup on the RV & kick over to a more configurable router. Although that Dishy Dualie is months behind the promised ship date.
If the DHCP scope on the Starlink router us only 128 hosts, you could hard code your gear to use an IP outside of the DHCP range but still in the same subnet. Not clear if Starlink only does a 128 IP range, but somebody else above indicated it might. That's how I run my DHCP ranges. .1 to .50 on a subnet are for network gear & servers. .50-.200 are DHCP. .201 & up generally don't get used except for wierd stuff.