Jars aren't 100% reliable also. My family relies on jarring about 80% of our foods, and have for decades. I also have several hundred pounds of tobaccos in tins and jars. I have had less tins, square and round, fail me than jars. And, the couple of tins that have failed me, I suspect were opened while on the shelf of the B&M before I bought them.
If you wonder whether a tin is failing you, check by trying to open it, which is my standard practice now before shelving them. If you wonder whether a jar will fail you, remove the ring and hold the jar up by the lid.
There is way less science going on with this whole jar everything notion than with climate change. And, it makes way less sense to me. Trade a fear for something even less reliable? But, this is me. You can all do what you want. But, most of what you pay for with buying tins is the damned tin, ha ha. And, taking a tobacco that costs four times as much because of the tin, then dumping it into a jar like a common cheap bulk blend makes me giggle.