Handheld is possible with P67 for SURE! But it depends!
All lenses " under 300mm " are with no problem for use without tripod incl. 200mm!
With 300mm and higher (look above my reply) it is relative!
IF YOU ARE ABLE TO WORK WITH 50mm and 35mm film below 1/30sek handheld you are also able to operate P67 with tele lenses!
Not every photographer is able (or willing) but if you did serve in the army you remember they did
show you technics - same technic is good for shooting with films (sorry to state but it is so

)!
And I am not speaking from sniper training

!
If you need big enlargements these technics find limitations of course!
I shot with 600mm AND low speed films from a harbour ferry - that was my limitation this day!
But a good tripod is of course ALLWAYS better!
with regard
PS : Never have ambitions to be better handheld than a tripod - especially if you shooting
movies

! But for normal photography it is realy possible - there the Pentax67 is one of the
best competitors in
midt format!
wy21 this experience had to make all photographers once a day! Then they had to make the next
experience if inspection via loupe is fine - what will hapen by enlarging above 1meter!
So folks come on : Open your archives of negatives to find out the percentage of realy made
100% sharp shots! It is for sure much lower you could imagine!
with regards
PS : For 100% sharpness you ALLWAYS have the need oft 3things :
1) a realy good stabile tripod from massive design/construction
2) a mirror lockup (also with 35mm camera don't be naive)
3) this fine tool :
View attachment 220319
If you are missing just one of these fundamental things you better should not prove how sharp
your negatives you have shot during all the decades realy are.....
with regards
PS : Exeption : real wide shots, shots above 1/ 1000sec. = you need min. 1 /2000 sec,
and ALL enlargements up to 30 x 40
midt format up to 70 x 90 !
So again : Try to shot hendheld with this here :
View attachment 220317
......and Trendland will wish you "Bon Chance" (even without tele lenses)...

!
with regards
PS : Plesse stop discussing that P67 isn't made for handheld

!