TDD doesn’t imply that you write all the tests first. It just mean you have to write a test before you write a line of production code.
The idea is to ask yourself “what is the first step I need, where am I going to begin?”. You then write a test that validate this first step and fail. Then you write the code to make it pass. Once your done with that, you ask yourself: "what’s the next step? ". You, then, repeat the process for that step.
This is a process you are going to do anyway. Might as well take the time to write some test along with it.
I’m not sure what you mean by “low effort”? OSRS is an incredibly good game and keeps getting new content all the time. I’m happy to pay 15$ a month since we get a free update every wednesday. Sometimes it’s just some hotfix , other times it’s a whole new boss or continent. We had an new part of the map just last week.
Yes there is bot, but I never felt like it impacted my gameplay other than lowering the price of some items. The team is also doing a lot to ban them, it’s getting much better.
The community is booming. If you look around on YouTube, there’s a lot of content creators doing awesome thing on OSRS: custom game mode, weird twist on existing challenges, documentary, etc.
Honestly, I think we are currently in the golden age of Old school RuneScape, and if you feel like the game is bad or low effort, it might not be for you, which is fine, but the game itself is not the issue.
I hope you find some other game to give you what you had with RuneScape back in the days !