I don't care about round start, but Domination going round based is plain smart.
Dom has been 'Cap A/B or C/B, camp enemy spawn' for approximately ever. Almost every map in CoD has had one spawn that was flatly inferior to the other in Dom, and if your team was pinned at that spawn, you were completely screwed. Often the only way out was an organized team, and even then you could struggle if your opposition was worth a damn.
Changing it to round based and swapping the sides guarantees you'll have an even shot at that pin. The shorter round duration will influence long scorestreak chains (which I'm neutral on), but otherwise, I view it as a positive all around.
Now if they had just done that for Sabotage, that mode could have been salvaged with a half time and a timer on the bomb to prevent endless holds... pity, I liked one bomb
The other big issue Dom has had for a long time is mortaring, because for whatever reason, no one at IW or Treyarch has figured out that simply
adding a wobble to the noob tube would fix that. All it needs is uncertain trajectory if it's in the air X time, or launched at Y angle into the air, and that'd take care of long distance nuking of dom points.
Going round based won't fix mortaring, but it'll at least equalize it, like all other imbalances between A and C.