I have worked for many companies and the majority of them are not technically complex. They are drowning in tech debt from when they were in a high growth phase and many of the employees they have are due to needing to handle that debt but the product itself is technically very simple.
That is massively wrong, and frankly an insulting worldview that a lot of people on HN seem to have.
The secret is that some companies - usually ones focused on a single highly scalable technology product, and that don't need a large sales team for whatever reason - those companies can be small.
The majority of companies are more technically complex, and often a 1,000 person company includes many, many people doing marketing, sales, integrations with clients, etc.