Congratulations. You have chosen the right flight simulator because most if not all of the default aircraft do have reasonably accurate flight dynamics indeed. Albeit there are issues here and there but it’s nothing that can’t or won’t be fixed in near future. There’s a reason why MSFS has a ten year long development cycle and promise.
Give the following thread a read. Read it slowly. When it comes to the flight model of some if not all of the default aircraft in MSFS 2020, there are many more real world pilots way more qualified and experienced than you who would flat-out disagree with pretty much everything you said in your post:
Nope I don’t think so. IIRC You have the right to express an opinion, no matter how absurd and inaccurate it is. 
In that case it’s great news, and it only means Microsoft’s strategy is working successfully: make a bunch of visually spectacular and realistic-looking aircraft as base default, build a few of them with reasonably realistic flight model (see thread with testimony from numerous real world pilots above), leave some of them with decent but not too realistic flight model and thus leave room for third parties to make money, which is how it should be and has always been in past flight sims such as FSX, prepar3d and XP 10/11. Nothing new here.
Microsoft and Asobo whole-heartedly disagree with your expertly business advice, and have never promised anything like that. They decided to go “broad”, focus on the base simulator, build a phenomenal and revolutionary base for others to build on, and have said so in public numerous times from the very beginning. They haven’t hid anything from anyone. If you don’t like their business model and technical roadmap, you are more than welcome to find and buy for yourself another flight simulator with 30 perfect aircraft with “reasonably accurate flight model” and two petabytes of world data included in the base default package for a mere one-time fee of £100+.