I think the importance of ambition and vision is highlighted in Tesla and Apple. With Musk and Jobs at the helm both companies were innovative and focused on the product. Once Jobs left, Apple has decayed into a marketing machine. Jobs said it best here how a company decays when product is not forefront.
Of course Apple is still a relatively great company, but the trajectory is very slowly downwards. It's a source of concern for Tesla that Elon is so critical to the vision and direction. He is unique in that he is an ambitious risk taker, an engineer and a visionary. Having said that, I think the vision of Tesla (speed up sustainable energy and transport), and SpaceX (base on Mars/other bodies after) are quite clearly set and will not change for a few decades, so perhaps Elon's importance over time will diminish with such clear goals set for the companies. Apple's objective of build easy to use and beautiful software and hardware is less ambitious and open to wavering imo.... it has less direction, less clarity in the objective. Apple now seems to be about maximising revenue.
The vision of Tesla and SpaceX goals are what people rally behind. The incremental progress out in the open. The setbacks and small steps forward. It's an iterative approach, building on top of previous versions of the car and software. A loop between drivers, engineers, production, designers, pushes the process forwards. Scale matters in the car industry. A lot of the problems are related to efficiencies, production scaling, data collection. It is this public, at scale iteration over decades which has driven both Tesla and SpaceX to achieve revolutions in their products, totally disrupting several industries. All the while pulling in money from active customers, and getting their feedback on the products.
Apple (Titan), Amazon (Blue Origin) and Google (Waymo) all come along with the approach of trying to spend their way to a solution, behind closed doors and without iteration at scale, putting them very much at a major disadvantage. Not to mention how much later they started on the problems compared to Tesla and SpaceX.
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My predictions for these three companies:
Apple/Titan - they will not make cars, but maybe will make a version of FSD they can sell to automakers if Waymo does not beat them to it.
Blue Origin - they move way too slowly to compete with SpaceX - they might be able to just copy Starship once they get New Glenn flying. They will be 5-10 years behind SpaceX though which seems too far.
Waymo - I think they will succeed 2-3 years after Tesla.