Some very important things get better because of the mass market and investor dollars. iPhone/Macbook are the canonical example.
The hard bit is to keep taste and discipline at the forefront of design. To not let short-term thinking pollute long-term ambitions. Easier said than done.
I think there is a split here because the enthusiast for iPhone/Macbook is a distinctly different breed than the enthusiast for cell phones/laptop computers.
I think Apple (very intelligently) made products where the average consumer is the enthusiast. Which is very hard to do when your company is a bunch of engineers.
If I remember clearly, Apple's hiring process low-key also looked for "good taste" and "product sense" even for pure engineers. Subtly different than anywhere else I interviewed. It's really hard to measure and quantify good taste and an intuitive feel for what's great, which is why most companies don't bother trying. "Just make number go up" is the norm.
The hard bit is to keep taste and discipline at the forefront of design. To not let short-term thinking pollute long-term ambitions. Easier said than done.