There's no need. PoE2 has trended downwards overall. D4 has been in a consistent range. PoE2 has had two major highs, at launch and with Dawn of the Hunt . The first dropped into the range D4 is in within a few months. Then the more recent one has seen it drop lower than D4 in a shorter span of time. Mind you I'm talking the general ranges. We'll certainly have to see what happens over time. The next major marker could be huge for PoE2 and change its trajectory or it could ultimately just fall even lower. I'm sure its eventual F2P release, which still sounds like it's a good deal away, will have a big impact. But we still just have to wait and see.
And, as I said, that needs to consider that a huge number of people bought D4 on Battle.net well before it released on Steam. You're not wrong for pointing out that the last month itself isn't the best way to approach two games with seasonal variations.
At the end of the day, PoE2 doing better than D4 on Steam at any point in time doesn't really change the point. It was a metric that I spent too much time on in my argument. Because PoE2's success is not an indicator of D4's success. PoE2's success would more likely be attributed to the things it does different or better than D4. Not necessarily the things it does the same.
The flippant remark that I responded to tried to paint PoE2 and D4 in the same glowing light. That person oddly decided not to just simply state their opinion of D4 and move on. Rather, to specifically engage with me and justify his contrary opinion to that of myself and my friends. Masking validation as some attempt to broaden discussion. The opposite of the factual conversation you and I are having right now.