MicroSD cards are a lot more enduring than stuff like USB thumb drives, and I've still got thumb drives I used heavily for more than ten years. I see no point in replacing something that is working.
Now, being so old, I'm not putting anything critical on them, only using them for transfers and such, but I'm still using them.
The same is true of my microSD cards (and all my dozens of flash based storage) - use it for half a dozen years, when I get a new / bigger / faster model, switch the old one out to light duty but don't throw it out.
I've only ever had one SD card fail on me, and it was dead out of the package. Other failures have happened, but were limited to the plastic casing, which a bit of glue fixes.
MicroSD cards don't suffer that issue and the flash memory used on (genuine) cards is generally much higher quality as well.
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