[takeda]

If you have own hardware (e.g. Data Center) that is running your own code that you trust. By going with containers you can pack more applications into the same hardware (less overhead), therefore your costs ate lower.

If you running in AWS, you use VMs anyway so the overhead is there no matter what (and also is not your concern, because you pay for the VMs). By adding Docker there you basically adding one extra layer on top of it, so from the infrastructure point of view you making things even more complex.