Dogma:
I think you are directing your complaint at the wrong people.
As HD as clearly explained: "No ATC speed restriction" means just that. We have no reason (such as traffic in front) for you to stick to 250 kts or whatever. If you need to do so to achieve turn radii or minimum SID altitudes (or even en route restrictions) or to minimise your noise footprint, then that's your business. You don't HAVE to accelerate!
Therefore, you should target your pilot colleagues to educate them rather than moan at us!