Out of all the issues DP had, these are the only ones with a chance of showing up again. Sure, the story would be inferior to that of Platinum, but it's still not an issue.I'm still going to say that DP is underrated as a base. Just a couple of minor tweaks (that were already done in Platinum, mind you) and we're getting a Top 5 Mainline game.
Dex Expansion + Mid-Game Level Curve fix and we good. Straight up.
The rest of things (such as the gam speed) are mostly minor matters in terms of effort, and since we already know diagonal movement is present, one can't take them for granted.