For normal use and everyday action, enter in the admin whatever address you want to use for the product. Whatever is last added is what will be the current address. Any previously entered address will go to the current address.
Sure from an outside perspective you don't necessarily want to frequently change the address of the product, but there is nothing wrong with some sort of change. Further, because an entered address goes to the same place throughout time, any address to that product is only a single redirect away and not complicated as if/when trying to do a bunch of redirects in an .htaccess.
Basically, stop overthinking things. You've been doing this stuff long enough to at least address the simple things. While the message may have changed or the help document location may have changed, its still the same thing and that troubleshooting doesn't really matter whether it is here or in some other software. It's just really easy here to identify, review and correct the issues. Some software lucky to find the log that identifies what the last big problem was...
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