The main argument for TFU is that the PLPD should be a force to be reckoned with, as it is so in real life. TFU are trained and more proper than old S.W.A.T, which is good. However, Perpheads aims to be as realistic as possible, to a fun extent. This does ofcourse not mean everyone has to be happy and always get their way in a situation, but that the server generally is fun. As many others stated previously, the idea I heard of regarding TFU was that they would carry slightly better equipment that other LEOs, and to equip heavy response gear when needed, which would be much better than the current system. The PLPD should be capable of dealing with gangs, and parallells are often drawn to real life, where criminals get torn down when enganged in shootouts against trained S.W.A.T teams. This is because the government has the resources, planning and hopefully, one of the most deciding factors; time.
When the old S.W.A.T system was around, criminals would get some time before having to deal with the S.W.A.T as they could not patrol, meaning normal officers would have to hold the perimeter and keep the criminals at bay. However, now the TFU can be right around the corner at any time. You should of course be wary of the PLPD, but then we come back to the part of PH being fun, everything is done in a fast pace. You do not have time to plan a really good heist, because residents disconnect, friends who would raid with you disconnect, and so on. Quite often, you have to act quickly, which does not seem to be possible when the TFU respond with heavy response gear within seconds, making it far too hard to be prepared if you are enganged in a shootout against the residents of a property.
The fact that TFU can be at a scene within 10-20 seconds due to map limitations and their ability to patrol in full gear makes it unfair, for a lack of a better word. Summarized, my reasoning behind this is that it should be possible for groups of criminals to go up against the PLPD if they fail to keep a raid quiet long enough for them to escape before the heavy response team arrives, which can quite often be hard.