Rasperry PI 64bit OS is now officially launched. Is there any concerns or benefit for Node-Red?
There were some issues getting the install script working, I think, but they were all sorted some time ago.
You need to make sure that all of your drivers and libraries have 64-bit versions. But on Linux that's probably a no-brainer. Even Windows is pretty well there now.
But it is unlikely you will ever see any benefits! 64-bit memory management has its own overheads and you'd only see benefits really if you had some very large memory-intensive tasks. And to hit that kind of thing, I would imagine that you'd need a lot more memory than you can get on a Pi 
Lots of things will be bigger on disk as well.
However, overall you shouldn't have any issues but probably no benefits either.
- 64-bit Raspberry Pi OS exits beta, is available for all Pi 3, 4, and Zero 2 boards | Ars Technica
- Raspberry Pi Removes Memory Limits, Unlocks Performance With 64-Bit OS (pcmag.com)
- Raspberry Pi OS (64-bit) - Raspberry Pi
So maybe some other benefits then.
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