That's my issue with them as well. TAG rounds are so far beyond anything else that we use that I'm baffled as to how a properly informed insurer would indemnify a site. Given the masses, muzzle velocities and ranges claimed, they're barely within UK air-gun power levels, which is a particular issue in Scotland. Something something pyrotechnic something, but there are also solid rounds, right?
The bangs are earball-hurty even outdoors, and given the ranges and time to target, any claims of precision have to be qualified with "at the time when you launch, not when it lands".
They were fun when I saw and heard them used (at a distance) at a filmsim. But they were used only by the organisers, and essentially non-competitively for theatrical effect.
Being aimed at people by J. Random Airsofter, that's another thing altogether. We've seen the injuries these thing can cause, right? Smashed eyepro, and significant tissue damage.
They seem like something which will only be allowed until its banned, and it'll be a safety rule written in some poor sod's blood.