Great in-depth breakdown, but an important takeaway is that it's prohibitively difficult to build an effective psionic in 5e with "normal" stat-generation. There's a lot of hangover of 1e's bias of "oh, you died, just roll another character" -- eventually one will pop up with three >16 mental scores.
Still, it's a fascinating rock-scissors-paper(-lizard-Spock) minigame system, and a nice way to revisit the edition of All The Tables.