As a generic rule of thumb: if it ain't broke, don't fix it.
So unless, you are looking for specific features, fixes, or platform support (some newer AP's don't run with the recommended 4.1.1.x Instant AP firmware), there is no reason to upgrade to an Early Availability (EA) release in production enviroments.
If you have issues in your enviroment, it may be useful to check if those issues are resolved in the newer version; all EA run through a complete Quality Assurance (QA) cycle, so they have been thoroughly tested before release, just not at many customers in production enviroments. If there is any doubt, please work with Aruba TAC for a custom advise in your environment.
Having said that, I try to run the latest firmware myself all the time, and do not run into many issues while doing that. However as an HPE Aruba SE I don't run a production enviroment, and I see is as part of my job to run the latest versions (or even beta firmware) to make sure IF there are issues, I see them first before they hit our customers.
Does this give you some guidance?