That means that any companies wanting to integrate dapps now can do so with just your run of the mill Javascript programmer. Quite a cost savings.

What makes a dapp superior to an app in the context of a single company?

Not sure on single companies vs. larger conglomerates.
In general, the answer is probably found by looking at what Dapps are:
https://github.com/DavidJohnstonCEO/DecentralizedApplications/blob/master/README.md
Anyone, please jump in here.

IAS