Hello, someone who went to a manager position here! I'm 100% with you, decreasing responsibility means decreasing stress and so is always a priority! However, there are a few reasons one might shoot for the moon anyway.
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Ambition. This is the obvious one, some people just want more. More money, more power, more prestige. That is a valid reason to push further but isn't for everyone.
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Empathy. Yep you read that right! Ambition isn't the only driving force to take on more responsibility. Empathy can lead people to see the ways to improve others' lives, workloads, and more!
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Accidents. Especially with children but also in other areas, accidents happen and can often leave people with more on their shoulders than expected.
I personally am mostly number 2. I saw the terrible leadership that my team has had in the past and the ways I could assist my team to improve. I knew all the complaints and had ideas to fix them so I took the responsibility bullet so they don't have to.
I hope this helps you see into the mind of someone who accepts responsibility, even if it means more stress and less freedom!
While I would love that to be the case, I don't think it is that simple. Java edition, at least, has been experimenting with shader-like features in resource packs for a while now. It could be that Luanti convinced them it needs to be built in and not an extra pack, but I think it is at best parallel ideas, or at worst, Luanti taking inspiration from those shader-like packs and trying to do better not even knowing they are doing the same process as Minecraft.