UBNT's AirMax line is not "wifi". Their LTU line isn't either.
Mike and Josh are actual WISP operators. You've stated you have no WISP
experience. Listen to them.
Neither will listen to me when it comes to FTTH so nah :-)
Seriously, it appears to me that both are speaking from a legacy point of view. The equipment deployed does neither use the new frequencies available now, nor OFDMA which is a game changer. If nothing changes, 5G will beat their pants off hands down.
Regards,
Baldur