I just bought my Trailblazer. I find the seats a little uncomfortable. I have an RS with cloth seats. I am 5'7". I feel like the seat bottom is short and no matter how I adjust the seat I can't get comfortable.
I kinda understand what you're saying. I'm 6'3" and also feel the bottom section could be a little longer for someone my height. The seats in my 18 Colorado ZR2 are the same. In both vehicles the seats have softened up a bit, so I barely notice it now. The seat bottoms are designed this way to accommodate tall and short drivers, so it's kind of a compromise.