there are a lot more possible recovery cases and in a professional environment you would not use the original disks/data but disk image files instead of the original disks as you are trying not to change the state the original disks are in to not deepen the problems (like hardware defects on disks) or want to have more the one try to recover data (depending on the situation you might need to find out the right configuration of things as of missing information and doing it with the original disks you have just one try and can't revers it if it s not the right choice), with image files und copy's of them you can start over and have another go with a different method, different assumptions of the state things are in or a different recovery software