Long-winded, rambling response coming up...It's strange . No cricket game have ever had realistic fields. You kinda think this is some thing easy do
In comparison to DBC 14 and 17, this point after release, it's miles ahead. I don't think '14 ever resolved limited overs fielding issues, '17 came a long way from release to the last patch and ODI/T20 were for me easily the best part of that game. Ashes feels about where '17 ended in terms of AI field settings. The good thing, rather than finding flaws in field selections 'why are there two fielders outside the circle so often between overs 11-47?' it's a case of looking at where the actual fields could be improved.
Aside from the odd anomaly, when the field selection just seems inappropriate, most of them look right. Maybe some of them need a backward point instead of a point or maybe there just needs to be more fields added with minor differences. The problem when you create a field on the editor is: it might look right, you use the right real life placements, but in the game it doesn't translate quite right on field. That's when you end up with the big gaps. Then if there are only a handful of fields to pick from, and half of them have similar flaws, the AI can't plug gaps like the human player can. I chased 200 in 30 overs, in overs 20-30 the fields were more orientated to blocking that area, but then those had only a short cover between Wide off and Point. At the moment they feel a bit too balanced one way or the other and the AI just doesn't/can't bowl to the fields.
This is where I feel I have too much of an advantage. I've a played a few games now and bowled out the AI three times (240, 62, 205). The run rates in general seem fine, but whereas in real life you might see 4 or 5 singles per over, in the game I'm seeing one single and four. I don't know how it works under the hood, I can only talk about how it feels to play, but because I'm able to tweak fields, bowl better (most of time) to those fields, PLUS the fact that the AI isn't running singles I think the AI ends up having to play riskier shots thus creating a lot of catches in the infield. As soon as the field goes out the pressure is eased, but then I'm keeping the attacking fields because I know it works and have already removed the top order after 10-20 overs. It'll be interesting to see the difference it makes when the AI does run more singles.