Old question I see, that popped up after a similar one I just responded to so had to read and must reply.  I definitely agree with accounting for accumulated depreciation by individual asset to see the NBV easily,
but must disagree with the other side of the entries, ie, posting all depreciation expense to one account. This may work for some small companies but not for all, particularly those in my industry and others too. Depreciation, like any other expense, must be properly recorded depending on what a cost represents, so for example in QB it may need to be split by Class if classes are used to define groups of expenses for different divisions or locations. Divisions might be business areas, for example if you have IT biz with alot of computer equipment used for just that division might need to segregate. Indirect cost pools as used in my industry of GovCon are another similar possible reason for needing to split depreciation expense. This is not something you can define in general for all companies but just know that there is no reason to be limited to only one depreciation expense account if/when makes sense see more detailed amounts.