I actually do carry a rifle at work. I have used it to clear broken glass in windows, as a step ladder for teammates, and as a brace to pull myself up. "More appropriate tools" are not carried by all of us. So "Tactical" still has a place for .01% of us...
I agree that I'd love my rifles to all weigh 4 lbs... hell, I wish they weighed 2 lbs... but not at the sacrifice of durability, reliability and "tactical" features.
As technology advances, those features are getting lighter and lighter. There's some great items out there if you're willing to spend the $$$. I invested in a carbon fiber wrapped barrel to cut weight. Using 6065 parts instead of 7075 helps. The new polymers that are available make a huge difference too.
I agree with you on the flash hiders. I'm a comp fan, but can see the bonus of a good brake. The new blast shields are nice for us .01% guys who don't want to blow up our partners... all extra weight