I agree fully, except for the downsides.
1. It's not Colmar, but if you were planting they'd take a while to get to middle.
2. They can tell everyone where you are, regardless of instant spawn or not.
3. I have both won and lost on numerous occasions WITH instant spawn.
The aspect of instant spawn is a great thing. I'm quite sure I speak for a few people when I say it's stressful when a team isn't interested in blocking the last flag, and you need to be there. Sometimes the reinforcement time resets, etc. This helps to prevent that, and gives you more playing time. With no Kill-Cam, it makes the game a lot more interesting as well. If your sniping from half way across the map, they shouldn't know where you are unless they see you shooting.