I too am nearly certain that the positive benefits are approaching nil, but I still feel it should be helpful.
I'd be curious to know the reqson why she would care on her own phone and why it would be an issue on someone else's phone?
Despite this, many of my relatives have somehow learned this habit of opening the switcher and closing all apps when they are done with them.
That being said, I dislike having 3 dozen apps open because I simply can’t quickly find and switch to the ones I’m using. So when I enter a new situation, I swipe all the way left, and Clear All apps, to start over with a tabula rasa.
But the switcher shows every app ever opened and tries to pretend these apps aren't being closed. Right now for instance, i just checked and as best i can tell, the last 3 were open. going back any further and i could tell the app had to reload. but i can scroll to the left back forever. the one on the furthest left i easily haven't opened for months
contiguous fragmented
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PCIe 4.0 NVMe Read Speed ~5,000 – 7,000 MB/s ~80 – 250 MB/s
SATA 3.0 SSD Read Speed ~500 – 550 MB/s ~30 – 60 MB/s
Still, given SSDs have a lifespan and given few of my files are that large, I think I'm personally okay without defragmenting. Those numbers are impressive but, most of 10s of thousands of files are source code text files. Asking online what the real-world loss is from not defragmenting> You are giving up virtually 0% to 3% of real-world performance. In daily development, media editing, and standard system use, defragmenting your SSD will yield no human-noticeable speedup.
Otherwise the claimed defragmentation here is not actually resulting in sequential data.
I haven't measured it but the SSD firmware should be able to look up where the next block is speculatively in order to be able to immediately start sending it if the host tries and read the next block (as opposed to a random one).