yes porting can give flash from the ports blinding your target picture. send unburnt powder into your face. if you shoot it from the hip you could possibly feel the hot gas and get burned. though you can get that without porting as well.
its possible to get too much gas through the porting forcing the barrel below the target. its possible to fine tune things with springs and handloads.
I would only uses ports on a gun I was using for hunting(tame big caliber muzzle rise) or competition(fast followup shots and little muzzle rise required for speed shooting).
dont have any ported guns but tempted to see what kind of a racegun a Steyr M9 or M40 could make get a scope mount and reddot maybe a new barrel and comp depends what the weight of the scope mount and scope does to muzzle rise custom handloads would be use for soft shooting but makre minor or major powerfactor.
with the pics just imagine two or more streams of the flash coming upward in front of the sights where porting would be
some night shots with SW9VE and Steyr M9
non flash suppressed powder
same load same bullet powder primer and case.
MrA's secret voodoo whodo juju added
M9 going off with same powder as first two
Steyr M40 with same powder
not that anyone shoots at night much. the flash doesnt stay around for even 1 second or half a second.
first two shots fired inside a brass catcher screen. last two are a cornfield. the flash is a result of oxygen.