My biggest gripe with the 2018 Mac Mini is that SSD is soldered to the motherboard. But at least with two Thunderbolt 3 busses (on 4 ports) you can connect up external fast PCIe SSD (like a Samsung X5.. and many more coming from other vendors).
I would also need a dock to use one, like this one
https://www.owcdigital.com/products/...3-dock-14-port