I don't think it ever could be or was the most important aspect of any of the playstyle one could go for. Removing anything related to hacking would be much more meaningful and impactful, as it is the playstyle and class. Wallrunning is just a peek, a nest little mechanic that can be fun if done right and encouraged (Titanfall 2).
It is said that wallrunning was scrapped due to design reasons, which probably means that the levels are built in a way that does require any of the wallrunning regardless of what you're trying to do - flank someone in combat, or go sneaky beaky unnoticed. It just looked fun in the 2018 demo, but it doesn't mean that the actual thing would be fun, necessary or useful more than a very limited amount of times in the actual game.
So, personally, I feel indifferent about that being removed. This is actually the way I feel about most of the recent news of things being cut out because our expectations of what Cyberpunk 2077 might need or be do not (and can't, and shouldn't) define the final game. We just keep picturing stuff based on raw footage we're being shown, completely disregarding the fact that nine of our expectations have to be true or on the same line with the devs' ideas. That is not very fair, especially knowing that we have never seen gameplay that has been proven to represent the final state of the game with no changes being considered or possible.