I get your idea, but “Seasons” are pure time based.
What you want is more like a “tag” that could be an additional search/sort criteria that may be useful, within and between “seasons”.
I’d like to see at least some pure tags added to each and every workout or outside ride uploaded that contains: Location (In/Out) and Power Device at a minimum. Those two factors can have a major impact on the power data reported and/or TSS and other power related data. There are likely others that would make sense (“regular” vs “tt” position could be another, since it impacts “functional FTP” in practice), but those two are the most common variables in power data and rider performance.