I mean when you think about it, “this season” is pretty arbitrary, too. Especially this season where not all skaters are doing the same / same number of competitions (for example, I think the entire US team just withdrew from the Asian Open), going back a little farther provides more data. Yeah the older results may mean less, and yeah it’s always a bit iffy to predict anything based on past results, but that applies to last week’s or last month’s competitions, too. IMO it’s not unreasonable to look at a skater’s trajectory going back to Worlds, especially under the circumstances. It’s not even a year. The other thing is, the US in particular is setting results at 2021 Worlds as benchmarks for their skaters to achieve this season. If you’re going to use it as a benchmark, it doesn’t really make sense not to consider the actual results as well. At least, that’s my opinion.

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