I consider,the state an installation is left,whether visible or not,indicates the quality of the entire job.
Industrial sites aside,where on occasion,very old,original cables can be brought back into service,i would always make efforts to remove what was redundant.
My clients would not be upset to see me do this,indeed,some would expect it,but none of them come via advertising.
In the cut-throat world of domestic sparking,i readily admit these extra considerations would not always be possible.
Cables,bonds and other transmission items,can be part of future problems,they can slow fault finding and dissection inspections.
The value in scrap rarely covers the labour of extraction,and if we don't leave the mineral sarking under the roofs new breathable membrane,we should seek similar with our electrical work.
Maybe some of us do go a bit OCD,and i have a couple of pals who agree...i even have a plumber/gas engineer mate,who has a pouch on his tool belt for a cordless hoover...but his installs are exemplary