Feeding you is fine, but the issue is that you would need to know what the enemies are doing before the wave starts, or you won't be able to anticipate on it. If you have a random person next to you, and there is a strategy to clutch the first waves for optimal results, those would go down the drain unless your neighbor holds. If this holding is up to the other person being good enough, or them expecting you to do the clutch, it would be either very risky, or downright silly to try. If you have a teammate, at least you can discuss things with them.
Team battles:
You are right. but if team 3 leaks, then they will not get the amount of gold that team two had already gotten from the earlier waves. Basically team 3 could start with easy sends, but they can't go as greedy as team 2 could since they know that team 2 is saving up. They send whatever they can, but still have to beef up their defenses to be able to defend the potentially killing wave.
Team 2 obviously also isn't in the most favorable position, as they have to save up points that could have generated income instead if they had sent something.
So initially Team 1 would have a large economy, Team 2 would have a medium one, team 3 medium and team 4 high.
Team two sends annoyingly and expensively to Team 3, who would get leaked once by Team 2, which results in a downgrade to bad economy. to make up for this they resume sending easy and regularly to 4, which just makes that team 4 has an even easier time, and they can send more to 1 who was also already doing well, having both team 4 and team 1 go to Very high economy levels.
In a 4 way battle, I don't think any team would benefit from starting to send big waves. After all, you are messing up your economy while you would give the team two down the line an easier time. But yeah this argument can go both ways. If you start sending annoyingly, the other person may end up doing the same. So everyone either sends continuously, or sends difficult-to-defend stuff.
Mind games
Definitely agree that it may get too niche for the average player 😅 but it may be a cool spin-off of the current games that are being developed.