I have seen a lot of threads on a lot of forums about bike locks. If a professional thief wants your bike, they are going to get it, no matter what kind of lock/alarms you use. Fortunately, I doubt most professional thieves are looking for Enfields.
I rarely ever use bikes for transportation, they are more of a recreational thing to me. I did ride my bike to work for a couple of years a long time ago, right after buying my house, for financial reasons. The parking lot was completely fenced, with electric gates, which only employees had cards for. Still a few vehicles were stolen. My answer to both possible theft, and the AZ sun was a bike cover. People, including thieves, tend to not notice what they can't see.
A few years ago, someone brought in one of those Kryptonite U locks that was missing the key. We decided to see just how secure it was. It took just over 10 seconds with a cordless angle grinder with a diamond cutoff wheel to cut through it. In other words, it was worthless.
But while nothing is going to stop a professional thief, most bike thefts are by common street punks. They see an easy target and go for it. Virtually any kind of lock will stop them. Still, if you leave your bike in a parking lot often, and have any way to carry one, I recommend a bike cover.