Simple; the option to have plutonium mode is not available, just removed.
This would be perfectly fine if it was mentioned in changelog but boom, out of the blue, gone.
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Plutonium Mode was an experiment, so there was never any reason to expect it to be documented as a feature would be. However, it was a very successful experiment and the current plan is to implement it as a true feature. It was going to be turned on permanently, but Mojang decided after a bit that maybe they'd better keep it optional just in case. I don't know this for a fact, but I believe what may have happened is that it was turned on and the toggle was removed in this update. The toggle should come back in a future update.
Meanwhile, do you actually need the toggle, or were you just reporting it because you thought its absence might be unintentional?
I don't NEED it, but it keeps my game from stuttering on servers. I get like 30-40fps on a server, and a stable 60fps w/ it on.
So to answer no I don't, but I really do like it.
Thank you for your report!
However, this issue has been closed as Working as Intended.
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Also point of removing it while Tommo wants to make it non-experimental is??
https://twitter.com/_tomcc/status/909227629517037569?lang=en
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Plutoniuim mode used to appear below "render distance" slider