I wish the world worked this way, but I don't think it does, especially in tech. If you "do one thing well", the cloud hyperscalers will use their billions to copy whatever that is, and add your "one good thing" into their bundled subscriptions or cloud plans. At which point, any rational CTO will go "why should we pay for this, when we're already getting it via AWS/O365/whatever, and with better integration with our existing tooling to boot?"
I don't think "do one thing well" can succeed in this world, which is why Atlassian, Dropbox, etc. keep on launching things like office suites even though that makes no sense considering their core competencies. It's the only way not be streamrolled by FAANG.
I've seen it mentioned in the context of smaller countries competing with the big guys using industrial policy, and one example mentioned in that article (I don't have a link - it was long ago) they specifically mention Sweden and Volvo.
I don't think "do one thing well" can succeed in this world, which is why Atlassian, Dropbox, etc. keep on launching things like office suites even though that makes no sense considering their core competencies. It's the only way not be streamrolled by FAANG.