Debt can be a good thing, it can help finance growth or reduce monthly costs to increase cash flow. For the same reasons there could be justifiably good financial reason to get a mortgage even though you could pay for the house in cash, relating to tax benefits and other incentives.
Once you are consistently profitable, or have a high paying job that affords significant personal cash flow, you might be inclined to forgo all debt entirely, but on the other hand once you are in this scenario you are the least likely to default on a debt and have the capacity to take bigger risks by borrowing without ruining either your credit or causing an immense about of stress.
It's great I guess that they don't take the debt approach, but it's not necessarily a positive thing, and I bet I could look at their financial statements and see tons of opportunity to leverage debt that would free up cash flow so they could be making better use of their capital.