In practical terms, the money implications of moving the membership year (especially if you move it earlier, ie 'lose' 2 months) would be far more difficult to handle than the minor difficulties that arose from moving the events (points) season.
I agree with all those above that would like to see the events season restored to Nov-Oct. The reasons for altering it were always very thin IMO, and almost all the people who were prime movers in getting that change through are no longer involved in the running of AUK.
As for the 'history' - well historically there was a closed season of >3 months from late October to early February. For counting events this was, there were always a very few Populaires during the winter. Increasing randonneur activity (and maybe a bit of climate change) steadily put pressure on this period and gradually filled it in.
The events Calendar, when it was published annually, always ran from Jan-Dec even though the events season was Nov-Oct.
I agree the website is not clear enough about the events season as it stands. I might be able to improve that a bit.
As one who is involved on the 'systems' side of AUK, I can attest that a whole raft of things would be much easier to manage if the events and membership years were to be the same - however all the various kludges and fixes necessary to make this awkward relationship work were put in place long ago and don't need to be undone now! (Personally, I think membership would be better as a 'rolling' thing, as many other organisations do, but I think most people assume that way of doing it means more admin, not less.)
And yes, under the hood there is also a financial year which is different to all the above, which introduces its own problems for the people involved on that side of it.