I think peach players need to realize how broken their aerials are in terms of priority and speed (both start up and lag). Peach doesn't have a lot of range on her fast moves, but she can smartly and safely double hit with almost character -- if she doesn't hit through their attack.
Peach's dsmash is really overrated. Its probably her riskiest move, even though lots of peach players love the damage returns for it. There are a billion ways to punish it, and it only really works if the opponent puts himself into it (like fox nairing peach when she is at 0% or a shield grabber). With most characters you can shield the dsmash and aerial or wd OoS stuff.
Peach's dash attack is also a really **** move. It combos and is difficult to CC but shield grabs wreck it. The hitbox allows it to beat move aerials and the quick rush allows her some ground range she otherwise doesn't have.
Not to mention no peach has taken advantage of the edge canceled turnips. If you press down b as you run off a platform you cancel part of the turnip grab animation and continue falling off the platform. I think if peach players took advantage of this, many match-ups would become easier (falco and fox come to mind).
Oh yea, and a lot of peach players still don't realize how **** her combos are. Some of the stuff armada can do rivals m2k's marth in its prime. Im sure if you've watched an armada video you know this.
tl;dr peach metagame still can grow