Presently, all of the Polearms except certain TWF ones (Cane, Quarterstaff, Twinblade) follow the 20x3 crit threat range.
While this is /fine/, and 20x3 being quite effective at high bursts, it also leaves no diversity in crit range options. If I invest in 2H focus, I can use a 20x3 Maul, or swap to a 19-20x2 Greatsword if I want lower damage, higher frequency of crits - The option is there.
I'm not asking for an 18-20x2 variant, but- Even just one of the polearms being made 19-20x2 might help in seeing more use and providing some more versatility for polearm users. Maybe one of the newer ones, like Yari or Billhook?