Finish gear apparently doesn't last as long as we would like due to degradation that happens rather quickly thanks to Jano's testing.
I recently pulled some of my old vials that I brewed back in 2019, stuff was smooth as butter back then, now it's shit and causes hellish pip. I have no clue what went wrong, but old vials went in the trash.
Now short ester stuff I brewed from 2019, that stuff still works great with no pip at all and had a quarter inch of crashed hormone in the bottom of all the vials.
I tend to think short ester raws with higher melting points would naturally last longer and be more stable for storage. Low melting point compounds I don't stock up as much because I feel they'll degrade faster. That's one of the reasons I keep a large back up supply of everything I can in base/no ester/acetate form for very long term storage in case the international supply dries up for awhile.
I've found that storing my raws in sealed bags inside of 1 quart lined metal paint cans one of my better methods to keep air out.
I don't like the freezer because of moisture and temperature variations, but if you can remove all the air and enclose it so it never gets moisture in the container then it's a good method.