Enforced privacy is not as common as people think either, so you don't really even need to pull out the Smalltalk argument. In Java, C#, PHP etc it is not possible for the developer to actually enforce privacy like you can in JS because the privates are readily accessible through reflection if needed.
Another point is that the Javascript enforced privacy pattern only supports private, so 2 internal classes cannot get at each other even if they are maintained together as a package. That encourages creating god objects which is not surprisingly what I commonly see in projects that use enforced privacy in Javascript.
Comments
Enforced privacy is not as common as people think either, so you don't really even need to pull out the Smalltalk argument. In Java, C#, PHP etc it is not possible for the developer to actually enforce privacy like you can in JS because the privates are readily accessible through reflection if needed.
Another point is that the Javascript enforced privacy pattern only supports private, so 2 internal classes cannot get at each other even if they are maintained together as a package. That encourages creating god objects which is not surprisingly what I commonly see in projects that use enforced privacy in Javascript.