[gibwell]

You are contradicting yourself. You say that fill stack companies are hard to keep going and yet you say that non-full stack companies come and go even more easily.

By your logic, non-full stack companies are even harder to keep going.

[sien]

It's not a contradiction. Both are hard to keep going. Full stack ones are even harder. Hence all but 2 are gone.

The ecosystems for more open systems are also really durable.

Personally, watching for decades the most surprising thing is that MS has kept the desktop rather than losing it to Linux.

Would you say that MS has 'won' the server market because they make more money than any Linux company even though Linux has a largest market share of internet servers?

[gibwell]

MS keeping the desktop rather than losing it to Linux contradicts your thesis. You can dismiss it as a 'surprise' or acknowledge that your reasoning doesn't accord with reality.