hi harry
i was always told the same thing but i tried it myself and realized
that it isn't always the case. i first used GAF UNIVERSAL developer which is
a print developer ( i was never able to figure out which of the gas/ansco/agfa developers it was )
and loved it so much that i started to use ansco 130 ( formulary 130 paper developer ) and when i
ran out of $$ and thought i couldn't afford to keep using 130, i started using dektol, first in the pouch
and then mixing d72 myself ... i've used these developers quite a bit and have never gotten golfball grain
that i was warned about ... i used gaf universal in about 1995 or maybe 94 ... and found ansco130 ( thanks jc welch ! )
in the late 1990s or 2000 ... so its been a long stretch.
i've used these things alone in hand tanks,and open trays, hanger/tank, stand developed always similar negatives without massive grain.
also used them with caffenol either as an additive ( 20cc/L ) or as part of a divided developer situation where i develop 1/2 the time in dektol
or ansco130 and half the time in caffenol ... i get grain when i do that sometimes, but it is usually because i massively over expose my film
and / or use film past its expiration date, and maybe not because the developer. i've gotten nice smooth toned film with split developer too ...
hope the OP grabs some of the suggestions offered up and posts some results from his experiments !
( seeing that everyting is a suggestion and often times developing methods, exposure methods, type of light, shutters and fstops all change results )
ymmv