There are obvious benefits to a "centralized and linked" system as @Dan Hilton is suggesting. Some systems already integrate all aspects of property management, but the quality of each are inferior to specialized services. There are companies that specialize in tenant screening, while others specialize in contractor work or analytics. You won't find a specialized service with a "centralized and linked" system. The big players in the industry will promote their own product instead of integrating. There is simply no benefit to them for promoting another company's product.
Consider how Walmart can meet all your shopping needs. However, if you want a great steak you'll probably search for a local butcher. New trendy clothes? You'll splurge at Nordstroms. Each company/investor has different goals, so a one-stop-shop may work for some, while others appreciate specialized services.
Sure @Meghan Rowe, there is always room for improvement regarding market data analysis. However, an integration is only effective when the source it's information is coming from has quality. I would suggest that some industries need to focus more on the production and quality of data instead of how to obtain or report it through integrations. Both will be important for developing the "next big thing". Just give me an honorable mention when you take it to the Shark Tank!