In a live Q&A, the devs stated that the ground interaction is in large parts still legacy FSX code. It's like a binary switch, you're either on the ground or in the air, and that's why people feel this sudden jerk to the side when the wheels touch down or on liftoff. Weathervaning on the ground seems to be off, too, as has been stated. Sometimes you need considerable rudder to the left when there is a crosswind from the right.
The devs, however, said they will rework the whole ground interaction part of the flight model in the future. Let's hope they do it right when they get to it. I think many people are forgetting that in many aspects the flight model is actually a lot better than the old FSX one (and that's where they started), and in some aspects, it seems to be just on par with it.
I'm currently training for my PPL and flying a C172. In my opinion, overall the MSFS version is decent for a default plane. However, I have noticed some changes to the C172 flight model over time. Some improved things, some actually made it worse.
For example, the floating of the plane on the runway and induced drag feels about right now (as far as I can say with my limited experience). After release of MSFS, all the planes used to float down the runway like crazy. On the negative side, right now I need considerable power just to even get the airplane moving on ground. On approach etc. I also need a lot more power than I would in real life.
This was different in the beginning. Plus, last time I tried to do a simple power off stall in the sim I had a violent wing drop which usually doesn't happen that easily in a C172. I have the feeling whenever they improve one thing (like higher induced drag), it leads to a degradation in another aspect. Don't know if that's a general limitation of the flight model, that you can't get all the aspects right at the same time, or the planes are just missing some "fine tuning".
On topic: I think you'll be happy with the level of detail of the PMDG planes and the JustFlight Arrow I have in the sim seems to be nice, too, albeit not that complex. If you belive Fenix, their A320 will be at least on an equal level as PMDG planes, complexity wise. Let's wait and see. 🙂