I think it's more the strange thing to be able to set it at 0.00.
This happens on LSB too but to me there is no audible difference at all
between 0.00 and 0.05 and one cannot set 3.00 because all settings end
on 5 in SSB. Probably next FW update will be the inability to set the
low PB slope to 0.00 in SSB. I never use a low cut under 0.25 anyway...