Yes, i currently stay at Damansara Avenue, thats why I get to share many things I am experiencing here now. I used to stay DPC.  When it come to accessibility and traffic jams, It all depends on where you are heading. If you use MRR2 or Jalan Kepong , or head to Sungai Buloh, yes, there will be perpetuals jam at most hours. If you come from DUKE2, yes there is that interchange section bottle neck, but thats only an added 5 min or merging traffic, over that flyover, its all clear at most time of the day.

But if you plan a trip to KL, or to PJ or to Sungai Buloh (from DA) , never use MRR2 or Jalan Kepong. There are better alternatives.
To get onto DUKE 2 to go to KL, better use the U turn and use the alternative route through DPC/Menjalara. The Decathlon exit to DUKE 2 should also be quite smooth

You could also opt to use the small roads at Mont Kiara and end up in Sprint (depending on time of day)

I've not used MRR2/Jalan Kepong for a long time. If you use MRR2 ort Jalan Kepong to get to DA, expect KMs long craziness during most times of the day, esp rush hour
Vis a vis, the jam for DA is rather tame if compared to the peer jams at Damansara Perdana, Ara Damansara, Bandar Utama or even DPC nowadays. At these places you will have a traffic jam at the doorstep.

One reason DA is still not that bad is because density at BSD is still not very high, but might change with the many new condos coming up

The developer is saying they will have new roads and exits introduced soon for the DA master development, so that we will not have to all be bottled up at the current BSD exits.  You can visit the show room and see their masterplan scale model. the roads shown are pretty much what the developer have submitted to MBPJ, approved, to be built in stages