Have you tried the Working Title G1000? It will not resolve some of the complaints you raised, but it brings the Nav Unit closer to a real-life expectation.
The good news is the Working Title team bravely quit their day jobs to form a Partnership company with MS-Asobo to full-time improve the Nav Units among other things. It will get better, but not right away.
Notably, some of the things you’re also seeing is that the AIRAC data may be up to date, but individual airfields will need to be modified to reflect missing approaches, etc.
Lots of work, but we’re on a ten year journey (Product Vision) and as you pointed out, we’re not even a year old. To expect this product to be at the same maturity level of FSX (which only received two major Service Packs in the ten year life cycle, and would be a former shadow of itself if it were not for the collective efforts of the entire Third-Party ecosystem during that time) in less than a year is tough to reconcile.