Ok, anyone can build it - let’s say I believed that.

Now try to displace Salesforce, Slack, ServiceNow, Workday, etc.

No corporate buyer is going to take a chance on your homegrown vibe coded replacement that they saw on HN where the author didn’t even seem to know the importance of having SSO support.

Besides “no one ever got fired for buying IBM”. Why would I take the reputational risk of not just buying from the well known company who is already at the right square of “Gartner’s magic quadrant”?

Writing software has never been the challenge. If anyone can write software, Microsoft can just throw a few engineers at it and bundle it in thier corporate seat licensing