Brian, as you said we have different views on what is a finesse player, your point of view is valid, but you tend IMO to focus in the "use of" finesse rather than in being able to do it.
When you see Justine's size and muscular structure, you have to wonder how she can hit so hard, and it's pure technique.
She hits hard on both sides but on the backhand side, she can hit a very flat ball with some spin to just go above the net, or she can put a lot of stopspin on it, that's why it's so penetrating, on the forehand side, she can hit hard, but as her technique for that shot is not as mastered as for the backhand, she normally has to hit taller balls and put more topspin on it.
You said that Martina or Justine don't rely as much on finesse, well, for me to take the ball early is part of it, footwork is part of it, and the strokes themselves are part of it, sure, Justine or Martina can finish off the point putting away a short ball, and can take the pace in rallies, but that doesn't mean that Conchita has more finesse tham them, only that Conchita uses it exclusively, but I don't see Conchita (at her best, nevermind now) being able to generate the same sort of short as Martina or Justine. What you said about them is true, but it's more a result of making a choice regarding style, what they think it's the best for them, and they have the skills to do it.
Regarding Graf, it's true she relied more on the power of a flat forehand, but Steffi was certainly able to play with finesse, for me the issue is not playing styles but the capability to do certain things on the court and in that respect, I don't think either Martinez or Dragomir are even near Martina or Justine.
About Anna, well, she certainly tries to overpower her opponents and there you have IMO one of the reasons for her lack of success, Anna is capable of a fine touching at the net, she can hit different spins and angles,she can mix up, but she has a really poor shot selection and she normally chooses to outhit the ball, that's her mental approach to the game and has nothing to do with her ability to play in a certain way.
A different case is Venus, and I know some Venus fans will get upset at me for this, but the point is that Venus has phenomenal athletic abilities, she is very fast, has long legs, long armas and she is very strong. She can hit the ball very hard using her strenght, and of course, she has the technique to put it inside the court, but you can see her many times hitting the ball in a real bad position, with one leg in the air for example, her speed, height and a good shot technique allow her to walk away with that, but a player with less impressive physical conditions would certainly fail doing that. Venus can play at the net, but usually after a huge serve or groundstroke put her opponent out of position and she just needs to put the ball away, I can't imagine her changing pace, height, spins, and one of the reasons maybe because Venus simply doesn't need it, her power is enough to win matches.