The average potency of flower products (like grown bud, dried, smoke in your pipe) of Colorado commercial cannabis is about 19%. Not 20%, not above that, but a late "teen" percentage. Most cannabis grown isn't hitting these high, astronomical numbers. I have seen several cultivars (photoperiods, clone-only genetics) hit single digits in terms of THCa potency. And some of that weed was still fire too lol.
THC has gone to nearly pure marketing anymore. It's not that it's not important, but it's an easy number to manipulate, easy to explain to consumers "hey dumb dumb, bigger must be better and that's why it's more expensive," and that's why "tiers" of quality in most dispensaries are based on THC percentage.
If people were smart; they'd ask for the lab breakdowns showing percentage of all tested cannabinoids and terpenes.