I feel the AI aiming for the gaps for 2s and 3s are really well done in this game especially at legend level the shot selection from AI was really impressive for me.. Tailender edging right in the slips gap is something thats acceptable I would say as its more genuine kind of edge and the ball isnt made to go in the gap rather logically it would be going that way, so in that regards I feel BA did a good job in this..
About T20s cant comment but I would suggest you to try out in legend with sliders not the default one.. Run rate slider is main one to see how AI plays.. As far as I have played it feels like higher the run rate more chance of wickets as AI plays more aggressively also scores faster hence lot more opportunities for wickets as well..
One thing which I feel AI is poor in is Short balls so thats an area exploited when bowling..