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You need to stop worrying and just live your life.
I've seen people get worked over and concerned over microscopic blemishes on their Apple products here on this forum and my question/concern seems out of place? Just trying to keep a healthy SSD doesn't seem like "over worrying" to me.
 
USB flash drive will probably work.
But it needs to be large enough.
I would recommend that you format it to HFS+ (not APFS).
 
Instead of getting an external SSD for torrents, can I get a SSD based USB flash drive with 128 GB or 256 GB (or however big) to download torrents to which I then transfer to my external HDD?
You can but flash drives are not designed for many write cycles. Just use the HDD.
Why is that?
For much the same reason, APFS is likely to be more active managing the storage than HFS+ and so doing more writes to the flash drive.

Going back to a much earlier post:
the torrent starts downloading when added but then slows to a crawl and finally stalls. Then after a few minutes, it starts downloading again but at a slow speed (around 4 MB/sec) and starts fluctuating up and down.
In my experience, typical of torrents. Any TCP/UDP connection is liable to have a saw tooth like speed profile unless managed carefully by the devices at each end - exacerbated by high latency (long distance) connections. Connecting to multiple peers helps to smooth out the fluctuations.

In addition your ISP may actively detect torrent data streams and throttle them. Using a torrent-friendly VPN service can mitigate this.
 
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I've seen people get worked over and concerned over microscopic blemishes on their Apple products here on this forum and my question/concern seems out of place? Just trying to keep a healthy SSD doesn't seem like "over worrying" to me.

Your thread title is asking if it's safe to download files to your computer. Yes, it's 2024, you can download files.
 
I've seen people get worked over and concerned over microscopic blemishes on their Apple products here on this forum and my question/concern seems out of place? Just trying to keep a healthy SSD doesn't seem like "over worrying" to me.

The lifespan of modern SSDs has reached a point at which downloading large files will have no significant or even noticeable impact upon the lifespan of the device.
 
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