Great articular... But, forgetting the (apparently GBs) of size, isn't this really what docker and such like are trying to achieve? (maybe I'm missing something

Great articular... But, forgetting the (apparently GBs) of size, isn't this really what docker and such like are trying to achieve? (maybe I'm missing something). Especially when it comes to only storing a single instance of the base image if all 50+ users are sharing the same image? So it will only store the differences in each container. It sorts out your network issues, user can be root in the container and bind to whatever port they like and IP addresses are assigned to each container... What other overheads are there? (this is a rhetorical question - you seem much more knowledgeable than myself) :)