Check out the Deathwatch RPG, the Tau like everyone else have a very dark shadow. Forced sterilization, oppression in the name of the 'Greater Good'. As they are written in the Codex the Tau don't 'fit' in the 40k lore, they are to 'good'. Remeber we have 20+ years of lore for how the Imperium has gotten where it is. They - like the tau - are pragmatic in promoting a greater good.
Brighter the light, the darker the shadow.
There are NO good guys in the 40k universe, just an unending sea of grey about to be consumed by Chaos and/or the Tyranids
We currently do not trust humans with our tech until the Imperium's total annexation into the Tau empire. Food and other necessities will be generously provided for those who follow the path of the Greater Good. However all other luxuries are limited to Tau citizens.
Probably will, and not that dreadful coffee the Imperium has currently. Furthermore, you could serve the Tau as a mercenary, and therefore possibly have your equipment and weaponry improved by the Tau, like they did with the Kroot.
Seems legit. Although the chest/leg armor seemed more bulky than normal. But in propaganda posters they always tend to look exaggerated. We're thrying to convince other races to join the greater good, not produce a technical manual.
Maybe Okay yes Sort of... there is a very dark side to the Tau (see the Deathwatch RPG, the only place they really feature ouside the codex) No, even the write up for human auxiliaries in WD the get flashlights (unless there is a codex entry I haven't seen)
In my opinion, the dark side to the Tau happens when the humans didn't fully embrace the Tau.
According to the fluff, indeed the humans still have their flashlights to locally defend themselves. But when things escalated into a war scenario they will provide them with advanced Tau weaponry and fight under the Tau command to rectify the problem.
I guess the Imperial Infantryman's Uplifting Primer was right: 'It is probable that you will be subjected to Tau propaganda (the method of controlling the populace by lying and distorting the truth; something the Imperium would never stoop to). '