The modern logo has to work harder than ever before. In the past, a company logo was perhaps intended simply for a shop sign and printed in local newspaper adverts. Today's logos have to work with a growing plethora of smart devices with varying screen sizes and resolutions, displaying responsive websites.
Often logos end up suffering within responsive website design. Many have not been designed with responsive frameworks and variable sizes in mind, and are just resized to fit whatever available space has been provided for them or not.