Anecdotal accounts to make the rule. It rains in Florida in the "dry season", but that doesn't mean the wet season is year round. Seasons indicate a high percentage. IMO...chase "season" is about statistical numbers and percentages, and while the high plains, the south east, and even the mid-atlantic can still see seasonal spikes...it is not "chase season". Aside from the weather itself...also look at the number of chasers out there. Tour groups are shut down or shutting down, out of region chasers have stopped traveling long distances, etc. There is just too much to me that says it's over.
This doesn't mean you can't chase, and won't get stuff, but we have to look at it in a quantitative way. Otherwise....it's not a 'season' at all.