Alright, time to explain myself.
First off, you're right; I do play a lot of competitive commander. I prefer the high end of things because it requires a lot more thought in both deck building and play. Everything you do matters, so there is less room for you to make mistakes. I do tend to carry over a lot of what I've learned from cEDH into my casual decks, especially with the support packages (mana ramp, removal, card advantage).
Now with respect to Haldan+Pako, I'm not doing the competitive build. That one tries to get
Pako, Arcane Retriever out by turn 2. I'm aiming for turn 3, which assumes that I will play one ramp spell turn 1, and a second one turn 2. That's doable. My win-condition for this deck is also weak. I'm trying to play my opponent's cards and hope to win off of that somehow. It means I'm using a lot of sub-optimal cards like
Reversal of Fortune and
Wildfire Devils. So while the deck's mana ramp and support packages are strong, the core of the deck is not.
So, what do I consider casual? Honestly, it's not about the goal of the deck being winning, but rather it's effectiveness at winning. I don't know if you've ever read the blurb on the insert that comes with Commander pre-cons, but it gives a description of how to play the deck and how to win. These decks are made with winning in mind. They're not very good at it, but that is the goal, and I dare say that no one will ever say pre-cons aren't casual. To me, a deck is casual if it has a slow game-plan. If you're winning around turn 8 or later, it's casual. High-power tends to end games around turn 5 or 6, but they can go on longer. cEDH decks aim to win turn 3 or 4, but high interaction causes games to go on later.
Now is this skewed by my personal experience? Probably. I call Scarab God a strong casual deck. Back in February I beat someone with a Najeela deck, which he considers his strongest deck. Later in the commander group chat I set up he was talking about how Scarab God had to be a power level 10 deck, to which about three other people chimed in with "That's Morganator's weakest deck". You can see there how what I considered casual was someone else's version of top tier.
In short: I define a casual deck as one that is not cEDH or high-power. If your deck doesn't consistently try to win before turn 8, it's casual.