I was suspicious of that when I read it. Just commenting that there is a lot of conflicting information out there.When optimized battery charging is working it will keep the charge around about 80%-90% according to the battery indicator. It doesn’t show 100%. Whoever told you that is wrong. I haven’t figured out why it works well for me and others can’t seem to get it to work. It does take several weeks the first time it starts working. After that it seems to kick in sooner—usually within 24 hours for me.
I wish that Apple would give us this optimized charging system but give us an alternate where we say, just charge to XX%.