I did not disagree with buying insurance. However, are you willing to accept the hassle of losing a bike, and waiting for a check to come which could take months? Do you leave your car unlocked with the key inside the car because it's simpler to do that? Of course not, so why treat a costly bicycle any differently? You lock up your bike like you would your car, and you insure your bike like you would your car.
Of course, we're talking about expensive Ebikes, but even expensive regular bikes should be treated the same, but if you have a bike worth less than $2,000, getting insurance on it doesn't make sense, because over the course of 5 years of paying for the insurance you darn near spent the cost of the bike on insurance! So all of that has to be weighed out before a person decides if it's worth getting insurance with monthly premiums, or annual if that's how you pay.
I have several bikes, but only 1 is insured with a separate policy, but I don't have the insurance for the reason of theft, though the policy does cover that, I have it more for crashes. Because like you said theft is not a common thing outside of big cities. But even in medium to small cities, due to the cost of a simple battery-powered angle grinder with a battery that can be bought new for as little as $70, makes a thief's job so much easier, and thefts do happen, and in fact, are on the increase by roughly 25% in the last 3 years, but some of that could be due to the lack of bikes on the market which made selling used and stolen bikes more profitable.
And if all you are worried about is protecting your bike against theft, and not crashes when it comes to insurance you don't need a standalone bike policy, your homeowners type of insurance covers the bike away from the house. All you have to pay is the deductible and depreciation which could be substantial. My homeowner's insurance has a $2,000 deductible! So none of my 8 bikes, except for the one, would be worth putting a claim in for! Unless they were all stolen at the same time.
The Hiplock D1000 doesn't weigh any more than better traditional D locks, in fact, the weight is about the same as a NY Forgetaboutit D Lock. The only disadvantage of the HipLock D1000 over the NY Forgetaboutit D lock is that it cost about $150 more. So again this boils down to how expensive of a bike are you locking up? why buy a $300 lock, or even a $150 lock to lock up a $500 bike? So you have to consider the price of the lock vs the cost to replace your particular bike. Of course, all this lock stuff only applies if you are parking your bike someplace where you can't keep your eye on it for long periods of time. Parked in the garage of your own home you don't need a lock or extra insurance, your homeowner's insurance will cover it for theft. When I commute to work I just take a simple chain with a lock, but I have security cameras where I park it, the lock just keeps someone from snatching it too quickly; when I go bike camping I go even lighter with just a cable lock to lock it to a picnic table or a small tree, so someone can't quietly sneak off with it while I'm sleeping.
Well, that's a lot of rambling about nothing!!