Just a few comments...
Within initial global deliveries being 15 months ago, the SRI reset and service manuals weren't a huge topic at first. The ADAS "complaints" have only existed for 6 months, and in one market. Ineos Automotive (in North America) has been hearing the brunt of those very vocal customers, but in reality they can't change a thing about the product directly. Also, in the first 6 months of a model roll out in a new market, dealing with non-critical things (such as a persistent ADAS disable option or an end user SRI reset) is at the absolute bottom of the list. The ADAS turning on at each start up isn't a failure or an error in the system, it is a system operating in the way it was designed. The complaint is that people don't like the way it was designed, which is seen as something very different. What is high on the list is making sure vehicles get to customers, dealers are set up/trained, staff is hired, etc. Personally, that makes perfect sense. A year ago IA North America was a team of 16 people (+/- 2 as this is from memory); it has grown to well over twice that now.
Even as of a year ago the service manual wasn't expected until after US deliveries started (and at the time US deliveries were realistically going to happen around the new year or early Q1 2024). A printed manual that is actually informative would be a massive undertaking of deleting useful information. And opening an online service manual without removing the IP would be a horrible idea. It is unfortunate, but not unexpected that it hasn't been released yet. If I were to guess, my feeling is that it will be made available to the public for MY25, assuming mid-year variants aren't still happening then.
The "average buyer" doesn't specifically exist for the Grenadier. There are a few "groups" of expected and ideal purchasers, and those folks are the ones who will search out the forum and other outlets. This very purposefully is not a vehicle for the masses. The reason so many dealers are doing off road events is because the vehicle is one that is intended to be surrounded in community with owners, this was a key factor in choosing dealers in the US; it is intended for those willing to dig deeper and wider