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Why use accounting software like Quickbooks instead of Excel spreadsheets?
I would say that all of the reasons you list in your question are valid, and I would add the following... You are in the landscaping business, not the accounting business. If you manage everything in spreadsheets, at least one of you has to become the bookkeeper and leave the landscaping to the others. Spreadsheets are "agnostic" in how you use them, so you have to turn them into an accounting system, which means you're now not only more of a bookkeeper, but you're also more of a developer, too, and even less of a landscaper. Accounting software is already developed by developers who understand accounting. Using it requires you to only perform the data entry tasks, and then you can focus on the landscaping, customer service, sales and marketing, etc., things that actually contribute to your business.  It is still good for you to understand basic accounting principles. Specialized accounting software will guide you through the process of learning and help you avoid making many of the costly mistakes you might have made in that learning process.