Even hex bolts are pretty easy to round off, especially with the cheap soft metal they use in a lot of furniture fixings. Torx are much better, or just a decent posidrive head and decent driver. Annoys me the amount of people that use a philips driver on a posi head and wonder why they have issues!
these screws don't have the 4 lines they are philips just really crap.
maybe it's because the metal is about as soft as the ikea lead allen keys