There comes a time when your current motorhome awning will need uprgading, either because it is damaged or worn, or because you need something a bit bigger. As your family grows you may need something to accommodate them all, and this is time to buy a large annex awning that can sleep many people at a time. Inner tents can be used to make little compartments that can be used for cooking and storing your belongings in.
Of course this will depend on the size of your motorhome, and whether there is a need for this extra space. You may find you don’t need one afterall, but many campers have one in store just in case. It is nice to be able to sit outside and wind down on holiday, so you can just use your awning as a sunshade.