At this point it is worthless to do anything to Mackay, but he is really going to limit which maps they can port into 2042. There are so many maps that currently have areas of the map that you can't access but are still "in bounds". One Grappling Hook shot changes that, and instead of 3 or 4 avenues of approach to defend, you have to defend 20 on a 360 degree swivel.
Sundance presents the same access problems. BF was always built on pathing and the only way you would get on top of inaccessible areas was with an aircraft. However, there are a bunch of maps without aircraft and those will all be broken with Mackay and Sundance. The entire map design and strategy is out the window. It becomes COD BF Heroes.