It is absolutely sufficient for the vast majority of users. Most people use Excel for lists, and for simple spreadsheets. There are some niche industries, like

It is absolutely sufficient for the vast majority of users. Most people use Excel for lists, and for simple spreadsheets. There are some niche industries, like finance, where there are legacy spreadsheets (where, scarily, much of the business is run. Wall Street runs on Excel spreadsheets) that don't run, and with users who have a very unique knowledge and can't easily accommodate the change, but that is a small minority. For new and growing companies that just need this sort of functionality, these apps are fantastic.