Why Does 2K remove classic arenas every year?

Every year we get a whole host of classic arenas due to the showcase mode, but by the next game they’re completely removed. Why do they do that? I have never understood why arenas will be in game one year, and the next they’re completely gone. especially because each year it seems like the amount of arenas you can purchase with vc goes down in numbers. This year I believe there’s only 6 in the purchasable menu, which to me just seems so ridiculous. And I find it doubly annoying that most of the arenas they allow you to play in are just the NXT arena with slightly different branding. Am I the only person who is frustrated with this??