It's much more obvious, but nobody is going to give two craps about you taking an angle grinder to someone else's bicycle lock. Bystanders don't want to get involved, and police don't pay any attention to bicycle theft.
Hell, one time a small company I worked for had five figures of gear stolen in a break-in... and then several other businesses in the area did, too. Well over $100,000 (retail) of equipment stolen by the end. Multiple cameras at multiple businesses caught them, including their van and plate number. The cops did the same, "yeah, yeah, here's your report, we don't care" until someone called them while sitting directly behind the van in question and told them they'd found the guys and to get off their asses and do something.
AFAIK nothing was recovered anyway, but I think they were at least arrested. Yay?
I honestly don't know what they do aside from give out traffic tickets and harass people.
So, yes, destructive lock removal can still be fairly safe for the thief, but there is still a lot of increased risk if you employ a proper lock that would require an angle grinder, and most thieves probably don't bother to carry around tools like that and will simply move on to one of many ample opportunities for an easier target: A handheld compound bolt cutter will cut through inferior locks faster than opening with a key, so why bother bringing bulkier more obvious tools that increase risk even a little bit?
It's not about whether your bike can be stolen: it almost certainly can. It's about making other targets more attractive.
They're considered motorcycle alarms but work on anything with disk brakes.
It also stops the back wheel from turning.
I am thinking of getting a Boosted Rev (escooter, $1,600) and have wondered how I would secure it when going into stores. It seems as if any lock under $120 can be snapped by 3-foot bolt cutters (and the more expensive ones can still be easily picked).
I think I would probably get a decent u-lock and also a lock that makes noise and is triggered by even slight motion (to draw attention if someone is fiddling with it.