Water (as in, not pure H2O) goes flat and stale for sure.
Oil will eventually become more viscous. But in a small sealed bottle? Over the period of not likely more than a year or two? Not gonna happen.
The culprit here is too much oil. Even when I use the pin method, I sometimes end up with enough that it needs to be broken in with 20 mins of play and lots of gyro flops. I find 10-ball bearings are more sensitive, too. The same amount on an 8-ball doesn’t seem to be as much of a problem. I’ve never analysed why that should be or if it’s just a coincidence.
Me, I usually just put on a drop, EXPECT it to be responsive at first, and break it in. If I put in so little that it’s totally unresponsive right after lubing, I don’t feel like there was any point.