How to attach a deck on the corner of the house

Burying the wood post will cause it to rot prematurely. Even ground-contact rated Pressure Treated lumber won't last forever.

The only benefit of burying the post (besides it being easier to do) is lateral stability. i.e. you can sometimes neglect lateral bracing this way.

Best practice for wood-post decks is to have the concrete extend above grade and use a stand-off post anchor to hold the wood post to concrete.

Here is an example of this with some knee-braces for lateral bracing. The braces don't match so I find this somewhat ugly, but the image is clear and easy to understand.

Footings here don't need to be deep so I often form my own square ones but sometimes I use bigfoot forms and I really like those. Although Shirlock's "mushroom" method is more than adequate if you are only required 8" wide.

The big drawback is that your footings aren't done right or don't hold up well and you have a deck that slants a little compared to the house. You could end up with a little dip or a lip when you walk out the door. This may take one year or 30 years or 100 years. If you don't have a ledger it will happen. If you are building on very solid ground maybe your concerns aren't as bad but eventually these two things will look like they don't belong together.

Builders like doing it this way because as long as the footings are good the deck should generally stay where it is compared to the house for a few years. Also what do you do if your deck is slanted 5 degrees or is pulled out from your house an inch or two. I really doubt there is a monetary remedy for slight frustration. And the flip side for builders is attaching. Messing up your structure or allowing water into your structure is not only very quantifiable but could also come back to hunt them soon after a build. So $$$ will dictate that a builder wouldn't attach to your house if it were their choice - especially if they are subcontracting it out.

Flashing a house for the ledger isn't rocket science. There should actually be flashing under and over the ledger. I have helped put up 5-6 decks, always used a ledger and never heard anyone have water issues. And these were just all put together neighborhood style - no pros. I can't imagine not using a ledge unless the deck was only a foot or two off the ground.

For your situation I could see going either way. The fact that you are going through concrete is actually good for waterproofing - concrete doesn't rot if you have an issue. But I do understand that you want it to be easy and without a window or door it would have to really go off course to look wrong.