The reason behind that is easy: if you spawn next to quad with a weapon, its the nuts. The other team has no chance to interupt this. And that can easily give the team with the lucky spawn a 10-20 fraglead and mapcontrol. At CTF it is not such a bad story, as the spawns for blue or red team are more balanced. But even there it would be for sure a boost for the game- and teamplay.
A command to vote it on the servers would be great, so we can test it. I also hope it is not that hard to implement .. so this could be a quick "update"?

Some infos:
Powerups: Strength(quad), invisible, shield, speed (and if there are other kinds of real powerups).
This change has nothing to do with: armor, health, megahealth, weapons, etc.
The respawntime of the powerup will be the same as before: 2 minutes
If anyone has a better idea to solve that problem or completely disagree, feel free to write it down. Thanks!