ok fur - lets go through this:

1 - what target is this? when would my target not be targeting what I want it to target? I have my box team and I'm targeting something that I want to target - sorry I don't get your point and see point 2 before you go off lol.
2 - If you need to set your slaves target to another toon to hand over control then simply type /target toon - sames thing as focus.
3 - The mechanics of focused based macros are the same as the mechanics of target based macros - they both provide the same amount of flexibility.
4 - Why is targettarget superior? because it's faster when switching targets. How do I know that? Because I've observed the difference between targeting systems in the same sessions - try it.
5 - FTL? This thread isn't about FTL, it's about generating a discussion based around different targeting systems.
6 - Again this is not about FTL.

point 2 expanded a bit: if your system is totally targettarget based then it works exactly the same way as a focustarget setup only faster when the target is switching targets - this - is the point I'm trying to get across. You can do all the same stuff only your response time will be faster, you may not notice it if you have low latency but if you have high latency like me then you will definitely notice the difference, plus it allows the use of focus for heals etc - taken that it's faster and faster is better, it follows that targettarget is 'clearly superior'.