Arknights is fun!

The anime has adapted up to Chapter 8, but this is treated as just a prelude. It's framed as a minor disturbance on Terra Continent, and since the text volume explodes from Chapter 9 onwards, I don't think it's feasible to combine multiple chapters like before. My personal hypothesis, based on assumptions, is that 9 seasons are essential up to Chapter 16. The related scenarios are critical and highly important, making it a waste to cram them into a single episode, but this is a conservative estimate. After Chapter 8, Rhodes Island becomes more active and the Doctor's self gradually awakens, so I'm personally more excited about adaptations of sub-scenarios. If all independent scenarios were animated, it wouldn't even be enough for 20 seasons. I think there's an aspect where keeping it at 3 seasons as an introduction to the game, rather than finding meaning in such expansion, would be more successful from a marketing perspective.