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There is nothing more frustrating than getting a puncture at the side of the road then having your pump release all the air (and the valve core)
Pro-tip: press the little black button on the hose to release the pressure between the core and the hose. Hey-presto: no more unwanted valve-core extraction.
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I think @Fox meant the end cap on continental inner tube valves are comes off when you use a lezyne or screw on pump you can unscrew that part when you disengage the pump.
The tube material aside the Race 28's I've had have removal valve cores which can be unscrewed by certain types of pump. There is nothing more frustrating than getting a puncture at the side of the road then having your pump release all the air (and the valve core) once you've spent ages pumping it up to the required pressure, leaving you back at square one.
Get Vittoria Ultralites.