@dalias my Huawei phones have an "Optimizer" app that tells me it is periodically deleting "junk" but never tells me what got deleted. Only barely better than useless.
The other feature I hate is Android now silently removing permissions from apps I "haven't used recently" even though they're always running in the background. Like microG services, which breaks periodically because its permissions get removed, even though Settings shows them still enabled.