I work in natural stone. There are several different types of companies just in this niche. Usually the flow of product is:
quarries -> factories -> distributors (us) -> fabricators -> kitchen and bath shops -> end user
There are maybe 5-7 major pieces of software for the first four stages. "Under-served" is an understatement.
Similarly, there are 10s (if not hundreds) of other niches within construction, each with its own vertical. Tons of niche software is missing.
When I see another niche analytics/forms/site chatbot/automate social media startup, I slap myself to make sure I'm not crazy.
There's a whole ocean out there, but most software startup companies are running into each other in Depoe Bay.