As you mentioned, the drivers the system manufacturers provide may be customized; that is a reason we always recommend them first. However, you may use Intel generic drivers while taking in consideration that you may lose such customizations or special features.
Intel supplies generic versions of its graphics drivers for general purposes. But, the computer manufacturer can change the features, incorporate customizations, or make other changes to the graphics driver software or software packaging. To avoid any potential installation incompatibilities, Intel recommends that you first check with your computer manufacturer and use the driver software they provide.
Most of Intel drivers are provided with a release notes document that you can find in the upper right corner of the download page. Such as this one for example: http://downloadmirror.intel.com/23496/eng/ReleaseNotes.htm