Yes, I just bought one for someone at work, got a good deal at Microcenter but I’m still annoyed that I couldn’t get one with less than 1 TB and pay less; the internal drive is not where our data goes.
Unless you have a really nice RAID array, internal still beats external. I like to back up hourly (a timeboxed rsync) to an external disk (and use Time Machine too on Macs).
It's not about performance, it's about location and a little bit about capacity. Everyone in the office keeps the data on a largish NAS over a 10 gigabit network.