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Typically deployment is a "solve-once" problem, even if you don't use docker. You set up chef, puppet, ansible or fabric to handle deployment, installs, database migrations and so on, and tweak as needed.

Of course that may not be the case if you have some kind of commodity service you have to install in lots of different environments, such as Wordpress.

if i need an entire "jail manager" just to run your app then deployment is not as easy as you kins think it is.

Incidentally, this attitude is why PHP is among the most popular target platforms among malware writers.

You should be running PHP in a jail as well though. People just don't.

There is a big difference with the word "should" and "need". While i should run PHP in a jail, it doesn't mean i need to. While with python, nodejs, ruby et al, i need to otherwise it becames a dependency mess for every app on the same server.