Oh. That's not at all insane. Look at Apple and compare them to every other phone manufacturer (especially pre-iPhone).
The iPhone blows way ahead when you look at top selling phone models because Apple doesn't make 30 different phone models. They make just 5, and only 2 are current.
Same with their computers. The MacBook Pro blows away any other specific computer model because Apple doesn't make hundreds of models like Lenovo, HP, and Dell do. Apple makes just 6 different models of computer, each one with a pretty distinct purpose.
Similarly, Tesla will have just 3 car models. The S, the X, and the 3. Each one will perfectly fit its target market. None of the hundreds of variants ******** that other companies do.
Pick the model you're releasing and go it 100%. Don't make dozens of prototypes then have your customer pick which one to buy.
There are several problems with that approach:
1. Cars are not computers, or phones, or watch. A purchase represents a significant amount of money and manufacturers build variants to hit price points within each market segment. That way, they can sell someone the same basic car for 25K or 50K+ depending on what the person wants. With Tesla, if you don't want to pay their price you have no other options, which limits the ultimate buying population.
2. Apple gets away with a small product line because no one else makes computers that run OS X. That is the draw for Macs, while other manufacturers are essentially building a commodity item that is easily substituted for by an Windows box. Thus, they must try to differentiate their offerings and styles proliferate.
3. Tesla is betting the company on each model. If they guess wrong and one model fails to generate sales they may very well not survive; whereas the other manufacturers have plenty of other vehicles to sell to make up for mistake; and can move production from, or simply stop making, slow selling ones. Tesla won't have that luxury.
Personally, I think the battery manufacturing and vehicle control technology is more valuable than the car building part of Tesla.
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Apple would be absolutely STUPID to use a chassis like the i3. Nobody would buy the damn thing because it has a real world range of under 100 miles. Tesla plans to ship a 200+ mile range Model 3 next year for $35,000 (before tax credits) and Chevy is going to ship the Bolt this year with a 200 mile range. The i3 is already outdated by a large margin and BMW doesn't seem capable of increasing its range in any meaningful way.
Unfortunately, it seems tax credits are starting to go away, so it'll be interesting to see how many people are really willing to buy a 35k car that has a useful driving radius of 100 miles. That's the real problem for EVs; they're great for short trips but pretty much useless for extended ones. It's hard to overcome a buyer's concern they can't use the car for a long trip without risking getting stranded.