Also noticed that all the reviews for Jim 1 and 2 are gone...

Ah, what would GOG be without their completely incompetent review system?

I also noticed that Earthworm Jim & 2 have the same screenshots; meaning they separated the game carts without even a modicum of effort towards separating them.

When I saw this I was really hoping they were updated, at least give us Special Edition of EWJ1 working on modern systems

I still have my original disc for PC but last time I checked didn't work properly on my modern system

The point is not about the bundle itself, but the handling of the bundles in general. On GOG you have to pay again for games you already own when you buy a bundle. You always pay the full bundle price, no matter how many games of a bundle you already own.
In case of the Earthworm Jim bundle you are right, not being able to buy the games separately anymore is even worse.

Have that been the Battle Chess Special Edition and did that contain all 3 Battle Chess games? Or have they renamed the Battle Chess games at some point?

Try Boxedwine and/or Wine. Yes, you'll be shocked to know that Linux is better at running old games than Windows is.

Yup, $6 for the whole she-bang until the corpse of Interplay decided to get super greedy and sell them separately for $10 each. Same for Descent 1&2.

I've basically given up on buying games like Ignition, Die by the Sword, or Messiah... for the moment at least. Too darn expensive. Other old, or very old (pre-2000) games (and some modern ones, too) have regrettably seen their prices go up considerably in recent times, but Interplay games seem to me the most egregious examples in this regard. I certainly regret not having bought them years ago, when they were cheap. I hope for a better price cut in future sales.
First-world problems, I know.
I've only made an exception for Descent (and will likely do for the sequels), since I really wanted to play it. Well, at least it is a great game and I enjoyed the ride, which eased a bit the pain of having spent 7 € for it.