I guess it's a balance. If you think their process makes workable chips for your designs, then you can use it. If you can't adapt your design to what they can build, then you need to build your own foundry. Chances are a reliable supplier will push the market in the direction of their process.

If we had someone making GaAs processors in the 1980s for a price competitive with their silicon counterparts and with a long-term roadmap, we'd have very different computers now. And some extra toxic waste problems.