One server is still going to run out eventually. To give you a very concrete example: The dedicated boxes I use at Hetzner have 2x1TB NVMe SSD by default. I can

One server is still going to run out eventually. To give you a very concrete example: The dedicated boxes I use at Hetzner have 2x1TB NVMe SSD by default. I can order additional disks for sure, but even so you'll struggle to get above a few TB of NVMe per box. But, adding another box is cheap and easy. Plus, a single server with many TB is a big single-point-of-failure, and if you want to scale it (vertically) you still have to take it down.