Your disclaimer regarding the 150 S tetriminos is wrong for modern tetris games following the Tetris Guideline since they use a 7-bag Random Generator, which means that there is a maximum 2 consecutive pieces that have exactly the same shape, and a maximum of 12 pieces between any piece with exactly the same shape.

aesthetics.....

Old versions are still available on the new launcher, however the old launcher isn't aware of the new location of the old versions.