'avoid debt' is too simplistic. Debt is simply an opportunity increasing instrument. You have no money to make certain investments that create a net benefit, debt gives you access to that opportunity, and it comes at a cost. If that opportunity is worth the cost, debt is great. Of course it makes sense to say 'avoid needless debt', or 'be careful taking on debt', but just to just say avoid debt is to also say avoid taking opportunities that you should be taking and throw out the baby with the bathwater. One could very well say 'avoid debt for needless consumer spending', buying a new TV with debt, usually at some ridiculous APR, just makes no sense.

For companies, debt is even more interesting, because in corporate finance you'll find that debt is subsidised through tax rates. It sounds a bit weird but it's true, and so there is an incentive to take on debt. In some countries due to the tax systems, this applies to individuals too, e.g. for mortgages, the cost of debt reduces effective income and thereby reduces tax liabilities further than if you saved up first and then bought the house without debt, such that in some countries people did not pay off their mortgages because deductible interest payments were attractive.

Debt sucks, I know, I hate the debt culture as much as anyone and as a European the American creditcard industry is something I pity, but the discussion on debt today is extremely one-sided.