Why you don't know what map pressure is
I see it around here a lot, X killer has bad map pressure, so they're balanced, usually in reference to Deathslinger but can be used for other killers as well. The problem is that ALL killers have map pressure, because it's an inherent feature of the game, and how to play killer well.
So let's start off with what most people mean when they say map pressure, map mobility. Billy, Blight, Oni and Spirits power, Demo and Freddy teleport are forms of map mobility. Being able to get from one point on the map to another quickly is a very powerful tool, and all the killers I listed are some of the best in the game. That does not mean they have good map pressure.
Map pressure is forcing survivors into actions that are not repairing generators. Can map mobility cause that? Yes, of course, but lacking mobility does not mean you lack pressure. Being able to injure and quickly down causes map pressure. So let's set up a hypothetical; let's take Pyramid head as an example, since he lacks mobility but has a great chase game. Let's also use Azarov's as a map as well since it has a good layout for this example. Match starts, you find and down a survivor at the shack side of the map, hook them and start a chase with another survivor. You are now pressuring three survivors, even if two of them are on the Shop side of the map. Why three? Because one is now hooked and cannot do anything, the other is actively being chased, leaving the other two to save the hooked survivor or do gens and let the hooked player go to struggle or die. So in that situation only one survivor can be on a gen at that time, or the first hooked player dies. You can theoretically pressure the whole map without ever leaving shack side.
That scenario is what pressuring gens is, not walking to and looking at gens. When survivors are forced to take actions that are not repairing gens, that creates pressure, because they then need to decide to do gens, or let their team die, weakening their chance a survival. This is where map knowledge and awareness comes into play, but that's a whole other topic.
TL;DR: Map pressure =/= Map mobility, and vice versa, though mobility can help create pressure.