As a Di2 and AXS owner, I would still go Shimano mechanical over AXS road if those were the only options. The only thing that pushed me to Eagle was a lack of FD plus I got a good deal through LBS. Sometimes it shifts beautifully, other times it sounds like 5 sticks of TNT in a piano, granted it’s making bigger jumps on 10-50 than a road cassette but I can hear every shift on the AXS road guys’ bikes I ride with, and I prefer the more “refined” Shimano shifting
I would be very surprised if DA came Di2 only. I can see disc only being true, but the price jump to Di2 within DA would really put off a lot of consumers, and also manufacturers who won’t be able to offer bikes in that “lower high end market”
Do wish there was a flat top chain for Shimano though, it looks very nice and the new SRAM chains are incredibly robust.