Oh it matters, but not to the level you've presented it.
And what level would that be? I've deliberately avoided coming to any conclusions as what the consequences of this data are, aside from asserting that it does, in fact, matter at some level. I never said "this should dictate your gun selection" or "this will make a bad player a good player" or anything of the sort. I've just said that I'm confident it can have an impact for a certain type of player in certain situations.
Despite your objections to the relevancy of TDT, I think it's interesting that you and I (who play the game in a virtually identical manner) both gravitated toward the MP5K as our SMG of choice. The most important question becomes
WHY?
WHY would we select the MP5K over, say, the UMP, without having this data? It's certainly not due to the MP5K's accuracy, recoil, or long-distance damage (which is 15pts lower than the UMP, and is also more manageable at distance). The same holds true to the TAR. I couldn't figure out why I was particular to it until I saw these numbers: the TAR is second only to the MP5K (and tied with the L86, but that is far less mobile).
Odd that all 5 of my classes are TAR's and MP5K's, and you've recently declared the MP5K a killing machine. Sorry, this is not a coincidence. You selected it for its TDT, you just didn't know it

. Its close-range damage, RPM, and manageable recoil at this distance translate directly to a very efficient close/medium range weapon.
In other words, it has a kick-ass TDT.
This data, which suggests a particular set of weapons for this particular style of play, isn't going to make a bad player average, an average player good, or a good player great. I believe it has the potential to take a proficient CQB player's ratio and give it a slight nudge if they aren't already using the optimum equipment. That's the level to which I'm presenting this, so we're clear

.
I promise not to argue this any further, that is, unless you're able to provide some empirical evidence to contradict my data and our experiences which both support it. We can talk all day about how to clear a room, lines of sight, planes, yadda yadda yadda, but that has no bearing on whether or not selecting a weapon with a low TDT is worth any effort or thought. Show me with something tangible and concrete that it's a pointless endeavor... like switching to, say, the Vector and maintaining your K/D ratio

.