Cosmic has sexy transparency effects but God the color schemes are so poorly thought through.
Out of the box their light terminal theme is flat out unreadable. Some of the chosen colors have almost no contrast.
Ugh.
And then if it is dark mode time but I pull up a terminal window that is semi transparent and it is on top of a browser window that has bright colors, again, unreadable.
Which is why transparency effects are mostly limited to cool screenshots.