Hi TS,
i'll be nicer, don't want to offend anyone
unfortunately this is not true all the time, although it is generally true.
a company has to do an anlysis on its cost of capital versus the cost of debt. True debt, tends to be cheaper but it really depends on what kind of debt... revolving credit, term loans, high-yield all have different rates. the problem of cost of capital is compunded by instruments like convertibles which have aspects of both.
so, equity is not always the most expensive form of capital raising. you also need to look at the future expectations... what is cheaper now could be more expensive later and vice versa.
i agree with your points for 1 & 2 as i siad back on like page 5 or so

but there are many other business factors as well
people often view debt as "bad." not saying that you are thinking this...btw, but some people do. debt is a legitiate part of the capital structure. how much debt is acceptable is hugely dependant upon the industry and relative risk