Not necessarily. If it sounds like it's "grinding", that's bad, or "clicking", like "tik tik tik tik" and the computer pauses for a second, that's bad.
That’s not necessarily true. It all depends on the flash and controller used in the USB drive. There ARE USB drives that are specifically designed for high endurance.
I have a USB stick that’s literally using an SSD controller internally and SSD quality flash. It’s much more expensive than a normal USB drive.
I would also argue that (micro)SD cards have very poor write endurance due to a lack of an internal controller.
Amazon sales and prime day and Black Friday are all totally bogus except for a few specific loss leader deals. Everything else is on sale based on marked up prices
6 bad sectors is not a big deal.