I still have 284s in 99DE and 99PE configurations, plus four Winchester 88s, but they are collectibles guns, too valuable to actually use.
I can't see any practical benefit from the 284 for the person who doesn't reload, as Winchester/Olin's single 150 grain PowerPoint factory load for the 284 has approximately the same level of performance as their 150 grain PowerPoint factory load for the 308 that is less expensive and easier to find. While the 284 has a larger case capacity, the longer case prevents much of that case capacity from actually being used if the cartridge is being loaded for use in a short action due to COAL restrictions.
