It's interesting to me they made this change... I wonder what spurred it?
In order to insure that the event retain its character as an event from which the winner will be indentified as an amatuer who should be considered for national and internation team recognition--
The USGA (which is the primary selection committee for such events) believes walking is a part of the game and hence their standards will be used at the CGA events re walking--
An event that permits carts by contestants tends to diminish the achievement of the winner (perhaps, at least, in the eyes of the national selection committees)-- This event has been considered one of national importance and its elimination of automotive transportation tends to retain its importance on equal footing with other major amatuer events, all or most all of all do not allow carts.
Spectator carts are never the issue since the Conditions of Competition may always bar spectator carts without regard to whether they are allowed for players-- This is a "quality of the champion" issue, not multiple carts on the course issue-