"tracking every useless byte...' must keep a d-base of where those useless bytes are or the useless bits or the useless temp files and so on... "

I think KC Softwares just made/used an unfortunate choice of words -- like every other cleaning app KCleaner targets known locations where temp files are stored, names & locations of cache files it's safe to delete, and so on.

"Win OS recreates hundreds if not thousands of temp files every time you start the OS"

Actually, the only time Win10/11 creates that many temp files is when you install all the available updates on the 2nd Tuesday of the month, or when you reinstall or upgrade. Just firing Windows up, the OS itself creates less than a dozen -- it's the installed software that's responsible for filling the 2 temp folders. [I've got several VMs I use for testing, & know that from compacting their VHDs.]

" ... if you start deleting them every day, the life of you HD will be shorten, it is best to leave them alone, the TRIM feature takes care of it very efficiently."

The effect of leaving them be or deleting them is likely negligible on a conventional hard disk, as long as you don't run out of space. With an SSD what you have to keep in mind is that you generally don't want to use more than 50% capacity, or performance will suffer [Google]. *For me* the main reason to get rid of the trash is that it makes image backup archives larger than they need to be. The larger the archive the longer it takes to backup/restore, plus it obviously uses more storage. I think you misunderstand TRIM... a conventional hard disk writes new data on top of old, deleted data -- it's a single step. An SSD requires two steps, an erase & a write. TRIM proactively erases deleted data to make future writes to the same storage blocks faster.

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