I think that’s exactly what makes this so strange. HP already was selling all-in-one PCs that did not look like iMacs at all. They could have continued with that – but for some reason decided not to.
In fairness to HP, the Touchsmart line is terrible. Bad build quality, BSOD's on first boot, awkward design decisions, atrocious touch experience, and literally forty preinstalled and thoroughly rotten "touch" apps that join forces with dozens of sludgeware packages to make the first hour of use punishing. The Spectre looks like a work of art compared to them.
(By awkward design decisions: there's a secret chamber that holds a secret USB port that's already got a secret USB stick in it that drives the radio for the included wireless keyboard and mouse)