Interestingly or maybe not, but my insurance has been exactly the same for my BMW 330xi and my Model 3. Then again, I've been with Liberty Mutual for 46yrs.
My experience with insuring Tesla has been frustrating similar across three (3) companies: Travelers, NJM, and Plymouth Rock.
Year 1 - I get completive rates, and life is good.
Year 2 - the rates on Tesla, and just Tesla, get jacked up by somewhere between 30-100%. The rates on other cars stay the same, or decrease by 1-10%, as they age and their value depreciates.
Year 3 - the rates on just Tesla get jacked up again, I switch companies. Wash, rinse, repeat.
No changes in vehicle, accident, or claims history occur between years 1 and 3.
I in year 2 with Plymouth Rock as of right now.
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P.S.: In fairness to the insurance companies, Tesla body shops' supply and availability have not kept up with vehicle sales growth. As repair cycle time is counted in months, the costs must be piling up.
P.P.S.: There is no indication that Tesla designs its cars for ease of repair. If anything, the trends are going in the opposite direction, with mega-casting making it THAT much more likely that even moderate damage will become a vehicle totaling event. So if anything, I expect insurance rates on new Tesla to only go up. *sigh*