I can assure you that PFD (primary flight display) interfaces are very much safety-critical. And they will be touch interfaces.

Personally I think it's an awful idea. I just watched the promotional video that I expected to give some answers as to why this design decision was made and I frankly ended up even more worried.[1] I can accept that I'm somewhat of a luddite when it comes to this and I might be wrong, I just hope these are thoroughly tested and actually solve real world problems, and aren't just a way for Boeing to save money or solve the problem of "hey why aren't there any cool touchscreens in here".

[1]: https://www.boeing.com/777x/reveal/touchscreens-come-to-777x...

You would have a difficult time finding an airborne system that does not already do this:

> I just hope these are thoroughly tested and actually solve real world problems

Changing from a legacy style to a new one is not cheap, and aerospace companies are not the type to spend money on useless, less reliable technology.