Install It If You're an IT Professional
If you're an IT professional, you should think about installing the iOS 10.3.3 beta in order to test systems and applications ahead of the iOS 10.3.3 release date.
Enterprise problems are extremely common after iOS updates. We get complaints about Exchange and various other apps and services after every single iOS update release.
IT professionals who support end users at a company will probably want to get familiar with iOS 10.3.3 to stress test for bugs and problems and also to help prepare for the inevitable support calls and trouble tickets from iOS 10.3.3 users later this year.
If you prepare, you'll be able to confidently answer questions and hopefully handle any problems iOS 10.3.3 throws your co-workers/clients way after the update is released.