I also found some nic buried in my wife's big freezer that I'd forgotten I had. A bit over 2.5 years old, in the original #1 plastic from WL. At first I figured it was probably ruined, but I mixed up a batch using one of the four 120ml bottles and it was colorless and tastes fine. So I decided to leave the other 3 unopened as an experiment and I intend to use one ever once in a while to see how it does.
However, a couple of years isn't a couple of decades, and #1 plastic isn't #2 plastic. My understanding is that #2 is considerably more permeable to oxygen than #1, and of course the permeability of glass is effectively zero, which is why it's the storage medium of choice for those of us who are planning for decades.
If I were worried about glass breakage, I'd consider buying a case of some kind of stainless steel bottles. That would probably be the best combination of characteristics; earthquake proof, completely impermeable, and won't leach any chemicals. The only catch is the expense.
If you stored nic in Stainless Steel or aluminium i would fully support it. I just think #1 or #2 plastic is a darn site better than glass when considering plastic is lighter than glass. Plastic is thinner than glass, and plastic bounces back when bumped or dropped.
I will admit that glass container is less permeable than glass but even glass is not ZERO as you claimed because air can get in around tge lid.
But the only way I would use glass is if i had it in a sturdy box with padding to keep the glass bottles from clinking