So for action/fps types is the trend to move away from the traditional linear type levels into open world games or not...
Nobody likes loading screens. Players hate waiting 30 seconds for the level to load. The dev team has slower builds and hate waiting 3+ minutes for the level to load. QA teams especially hate it when they spend a quarter of their day waiting for levels to load.
Since they are universally disliked, many games will try to get rid of them.
Many games will mask the loading by assorted methods. The slow elevator ride and the long hallway are both fairly common ways of doing level loads without a dedicated screen. They still take time but they don't feel quite as painful.
Streamed open worlds adds considerable complexity to the game engine. When it works well it tends to make life more pleasant for everyone. If you have the resources for it everyone will be happier, including everyone on the dev team and especially the QA team.
So while large continuously-streamed open worlds are increasingly popular, know that the costs are frequently measured in development-years. Everyone wants them, but they come with a fairly steep price.