These MinisForum "mini" workstations are designed to be a balance of features and performance. If you try and shovel some gamer level GPU into these things, you upset the balance of power and heat and it runs like crap and will probably stop working not long after.
MinisForum provides an Oculink card for a reason!
It seems people want to run Proxmox on them, map the GPU to a VM and then game on them. And turn it into the jack of many, master of none PC. Everyone is entitled to run whatever they want want, but if you want put a Chevy LS2 V8 inside your Toyota Prius so you can tow you RV, that is your choice.