As a longtime Mac OS user and iOS user, I've always been one to wait before upgrading to the newest Apple operating system. I was working for Apple, in their retail location in San Francisco, when iOS 7 first came out. We were almost immediately slammed with furious customers coming in, upset and righteously so, that the update had cost them important personal information including contacts and photos, and in some cases, the update altogether made their phone inoperable - a term we referred to as bricking since the phone is no more useful than a brick or paperweight at that point.
Increased security at a cost
The release of iOS 11.3 is also facing blowback. While it promised increased security for users, it brings new bugs. The audio skips around, is garbled or cuts out, and FaceTime calls have also been reportedly skipping around and losing audio, or Siri will randomly activate. The bug seems to only impact iPhone 6, 6S, and 7, but not the newer iPhone 8, 8S, or iPhone X, according to an article by Forbes. Apple's iOS 11 is not compatible with earlier iPhone models. Since a lot of people have ditched their audio players and rely on the iPhone to listen to music, this is a major pain. Released on March 29, It's already been out for a few weeks (I usually wait at least a couple of months to update), so this is not a one-time occurrence.
Apple's usual response to complaints about its buggy software is to update the software (which is not possible in this case) or to back-up your information, and re-install the iOS. No thanks, I'm going to sit this one out and wait for a patch.
It's not necessary to update all the time
A lot of people like to update their software as soon as it drops, but with new technology, even if it has been through extensive testing, a lot of problems tend not to show up until it hits the masses.
This is especially true for Windows and Android, as their products are usually released while still in beta, relying on user feedback for patches, a potential headache waiting to happen which is one reason that I switched to - their products are supposed to be finished and free from bugs when they are released. Unfortunately, that is not always the case.
Unless there is a pressing reason to update, or you buy a new phone with the latest operating system (users tend to be unable to downgrade their OS unless they completely erase the phone and install a new OS from an older system or backup).
Keep an eye out for iOS 11.3.1, which will hopefully patch the issues (but wait a few weeks before updating and check to see if there are any new bugs) or an 11.4 update.