Can someone explain to me why people always say Aatlis has long sightlines?

I hate this map so much. Seems like it's really good for dive because there are so many spaces that you can easily get cornered in. From a support POV I feel like I can rarely get in LOS of my teammates workout having the enemy tank or tracer in my face and it seems incredibly easy to isolate players near any point based on how many goddamn walls there are. Where are all these long sightlines people always talk about? Only once have I had a team that was coordinated enough to successfully play on Aatlis and I always dread that map because it's a DVa/genji/tracer's wet dream.