Rather than every match on a symmetric map beginning the same way, Variable Initial Spawns could allow for multiple opening rush strategies. On Sanctuary, for example, both teams could spawn in their respective Rocks, or on their respective Flag, or in their respective Cut. Both teams spawn in the same location, relative to their side of the map, but Variable Initial Spawns allow for differing opening rush strategies. Because Red and Blue’s initial spawns are always equal and opposite, it allows for variability from match to match while still being fair and balanced for both teams.
I don’t necessarily disagree with this idea, because I understand that you simply are looking for variety to break up the consistency, but maybe the better option would be to simply have different starting spawns for different game types. So ctf gets one set of initial spawns while slayer or oddball get others. That way there is still a level of pre game strategizing while offering a change up from the same old spawns.