Your lease for a minivan is not a lease for a Toyota Camry.
Toyota Deals | New Toyota Incentives & Special Offers Toyota leases cover normal factory maintenance for the first 2 years. There is no "required maintenance package" for this car. $1300 for regular maintenance on a car of this type is absurd.
I have driven Civics and Accords for the past 25 years, and have followed the maintenance schedules precisely. I have never, ever, spent $1300 in the first 3 years for maintenance.
The vast majority of cars sold today do not having timing belts.
Honda has not sold a 4-cylinder car with a timing belt in the US since 2005, when the D-series motor was finally phased out. R, K, and L series motors all use timing chains. While Honda's J-series V6 uses a timing belt, it is being replaced by turbocharged K-series motors that use timing chains. Toyota has similarly moved away from timing belts. Almost every Toyota built in the past 10 years uses a timing chain that does not need to be replaced:
Does my vehicle have a timing belt or timing chain?
100,000 mile valve checks don't necessarily result in any work needing to be done. One of my Accords did about 180k miles without needing a tuneup. It ran just as well and as efficiently as when it was new. It would probably still be running today if it hadn't been hit and totaled by an unlicensed driver. Still had the original cat too. Now, stuff did need to be repaired. Rubber coolant hoses cracked and needed to be replaced. Electronics failed (airbag computer broke after 12 years). Small motors that controlled power accessories wore out. Shocks started to go bad. The thing is, Tesla vehicles also have these components, and I don't think they are immune to failures of these kinds over the long haul. Corrosion is also a concern. Less so in the Model S and X, which are overwhelmingly aluminum, but Model 3 has steel unibody components that could be susceptible to corrosion. There are plenty of Mazda and Honda cars out there that still run, but are rusted out to the point where they can't pass inspection.
I agree that FSD could add a lot of residual value to Model 3, but it is my belief that people may be drastically understating Model 3's future maintenance costs. We just won't know for at least a decade how this will pan out.