Once again we have a case of one man's meat being anothers poison. It will depend on what kind of aircraft and what amount of stability you wish to design into it. A fighter jet, not allot, a passenger aircraft considerably more. For stability and controllerbility it is normal that the root will stall before the tips so that the aircraft has a degree of controllerbility in a stall. ie. the alerons still work and the aircraft stalls errect without rolling on its back suddenly and emptying the toilets into the cabin. This is not without compromise and so a fighter jet my wish to forgo this stability so it can become more responsive.