As I'm sure has already been explained to you multiple times already, the animators who make new dinosaurs are an entirely different development team than the code monkey who's gonna flip that switch and put aviaries and lagoons in the JP era. The art team making new dinos doesn't get in the way of the systems team working on crashes, behavior freezes, floaty jeeps, etc, and, oh look! They have been releasing patches that have made significant improvement since launch.
Also, what do you mean by "current gen"? Cause the substance of your complaint implies your talking about last gen consoles: in which case, yes, playing on obsolete hardware is going to have an uneven experience compared to the actual current gen consoles and newer PCs. Just cause they haven't dropped everything to change the design for your particular fixation doesn't mean they've given you the middle finger, let alone the rest of us.