I flew to Europe last month and both my outgoing and return flights had empty Polaris seats, which surprised me. Should have counted, but it seemed to be quite a few. The outgoing flew into Brussels, so I didn't think too much about it. The return was from Frankfurt, so that was surprising. I travel out of the US about 3 times a year now and this seems to be a recent thing. In the past few years (prior to 2024), all the Polaris seats seem to have been packed on my flights. Maybe they are being stingy with the upgrades, but that is just an assumption. I have no evidence of that.