Deadpool was in between franchises all these years AND his new film, not only is the third in the franchise, but it has several major hooks - one being the fact that this is bringing DP over to the MCU. There were five and a half years between the first and second Doctor Strange films, but he had two major appearances in two gigantic films in between and he appeared in two more films as well. Still, that did lead to his sequel not following up properly on certain threads set by the first film, but that's a different conversation.