Team spectating would actually reduce teamplay.
At the moment, if the builder dont tell you where is the om/or the eggs, you re lost and you dont know what to do. That means you re always oblige to communicate with teammates.
And that's only one example among others...
With team spectating you would get a lot of informations without even asking...just take the view of the builder, and you know where is your base/if it is in good shape, then take the view of the best killer in your team, and you know how the ennemy base looks like and its weak points.
Moreover, if the spawn time is so long that you badly need to find something else to do, that means your team has already lost. If your team had a spawn, you wouldn t wait more than 5 or 6 seconds...if its more than that, its probably because one guy is hiding but wont be able to do any harm to the ennemy. So you can take a book/check your emails and wait for the next map.