Key phrase: > My job involves building custom WordPress sites on more or less traditional, shared hosting. Yep, if your target environment is "shared hosting"

Key phrase: > My job involves building custom WordPress sites on more or less traditional, shared hosting. Yep, if your target environment is "shared hosting", then docker is not going to bring much advantages: the biggest advantage of docker is an ability to have exactly the right set of globally installed libraries/programs -- and on shared hosters, this is not possible.