It's a matter of habit. I played about 1,000 games with the original rule, and the score was approximately 50:50. After the change, I initially felt that there was a greater element of chance in the game due to the generated board and limited first move, but I've gotten used to it now. In any case, before the rule change, I had a fairly high percentage of games with AI where we both picked almost the entire board, but now the game ends sooner. Where it has helped a lot is in solo mode, where I felt that with a 3x3 board I could solve almost every board, but now with the new rule, the difficulty is higher, especially in 4x4 mode.
The win ratio is still somewhere around 50:50.