Yeah but Mariah's sales were 50K first week. J. Lo's sales would be less than half of that. The amount of money it takes to make an album with a bunch of songs that will not be promoted rather than investing in individual singles would not make sense. The financial risk factor is less by investing in one single at a time and if someone as big as Mariah low-key flops (https://www.billboard.com/charts/billboard-200) ~ Caution fell out of the 200 in just 2 weeks) what do you think is going to happen to a J. Lo album?

All of the older women are having a hard time selling albums to a generation that buys singles. Drake's album is doing well because it is a bunch of singles and he is more relateable to the current generation. J. Lo could put out a bunch of singles as an album and it would not sell so one single at a time is probably all she wants to do unless she decides to release a shot length EP.