I have written at length what totally ruins the current models for me.
This topic is not about the problems as such, it is more about the feasibility of solutions. Namely, the space to work with.
So recently, a new line of Framework 13 was released, which makes me wonder if something similar could happen with the 16, but hopefully with a different focus. In terms of policy and technical support, the company is friendly to creators like no other, without any competition that I know off. The products, especially those that matter, are a different matter. I suspect they were designed before the decision was taken to go full open source on the hardware, and everything was tightly integrated already.
The company makes a big deal of how thin the laptop is, and maybe it is important to some, but those seeking to make their own improvements, I would hazard a guess this is pretty low on the priority list, and that those would appreciate more space to work with. FWIW, I recently purchased a laptop whose chassis thickness measures about 25mm not counting any feet, and it does not cause any discomfort with heavy keyboard use. Either because things become possible at all like the trackpoint, or because it is just easier to do. There is also a lot that I could imagine I could improve that I did not mention in my post back then, because they are not deal breakers, but would be nice anyway. That definitely includes a latching mechanism for the lid, I am not the only one who would like that.
And the same goes for quite a few characteristics of Thinkpads in their heyday.
As it stands, in order to get anywhere, I need to redesign the lid in ways that language fails me to describe properly, to create a gap when closed, to make room for the other redesigns. The better approach requires changes to the main body, i.e. moving the hinges up and probably lengthen some cables a bit, but I am certain that the lid is much easier to work with and cheaper to replace if I have to do it myself. To be clear, it is not the chassis itself that should grow in thickness, but rather the top cover parts, otherwise I am just as constrained in the design of the replacements of the problematic part as before. I would suggest removable spacers/extensions/interposers for compatibility with existing keyboard/input modules.
With Framework, hope and despair are often two sides of the same coin. Now that the Framework 13 Pro exists, I hope that maybe there will be a Framework 16 Tinker or something like that. But I am not holding my breath.