The sudoku variants app on my phone just updated, and they added an "AI which determines which board you should play next based on your preferences".
Which.... Makes no sense! How does it know what I like??? My favourite part of this app is variety getting to play different combinations of different little variants!

And the only info it really has is: how long it takes me to finish a puzzle, which is not a good criteria for enjoyment.

Luckily, you can turn it off.