Why Dell not updating drivers......??

Hello sir ,

                 I have an inspiron 5521 with windows 8.1 installed on it and has a discete gpu AMD Radeon HD 8730M.. I would like to know why dell is not updating the display drivers.????.The last time one of the drivers was updated was around 1 year before.. I have visited the amd site and they have released around 5-6 updates after that featuring many perfomance improvements .....AMD drivers dosent support switchable graphics and hence we have to depend entirely on driver released by vendors..

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