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Is the need to issue bonds a telltale sign that the company would have a hard time paying coupons?
No, having to borrow money does not necessarily mean a company will have a hard time paying the interest on it. Similarly, having to take out a mortgage on a house does not mean a person will not be able to make their mortgage payments. Borrowing money can be a way to spend future money instead of present money (at a cost, of course). A company might not have all that money at the moment, but that in no way implies they won't have it in the future. And as you allude to in your question where you talk about "funding some … plans", a company might be able to grow itself—possibly increasing future profits—by borrowing money.