L-38
Pilot technique and skill has a lot to do with operating safely out of "short" runways. I've never flown any of these VLJets, but with the light weight of the aircraft with the relatively slow approach speeds, I would think 4,200 ft of pavement would not be a problem in a Phenom 100.
Over the years I have occasionally operated corporate jets in and out of Hilton Head(KHXD)airport, which has 4.300 ft of runway. The ramp would be packed with high performance jets which most probably operated under a Corporate Flight Department Ops Manual requiring a minimum 5,000 ft runway. If most of your jet ops are out of 10-12,000 ft runways I wouldn't recommend attempting 4,300. Our home base airport was 5,000 ft.
My HXD limits were; day, vfr, dry runway.
MotCap