DerbyDad03 wrote:

According to them...

Ridge vents need more intake than box vents to operate properly.
With a ~6" soffit, they couldn't put in enough soffit vents to
properly feed a ridge vent. Box vents tend to let more air out
than ridge vents, so in cases like mine, where not enough soffit
vent intake can be provided, they usually recommend box vents
over a ridge vent.

Let's think logically about this. You're being told three things:

A) your current soffit situation is suitable for box vents,
but not for a ridge vent.

B) ridge vents need MORE intake than box vents.

C) box vents let out MORE air than ridge vents.

Look closely at B and C.

Can they both be true statements?

Are these roofers saying that the volume of air going out of the attic
doesn't have to match the air coming into the attic? Because that's the
only way that both A and B can both be true.

If someone determines that you need a certain amount of volume-air-flow
OUT OF your attic, don't let anyone tell you that it can't be done
equally well with either a ridge vent or a suitable number of box
vents. (this is assuming your roof has a long ridge line to begin with
- which any gable-end roof will have).

Now, it's EASY to give your roof enough venting to meet any target
outward air flow. The question is - will it have enough INWARD or
intake air flow capability. If it doesn't have enough intake capacity,
then it won't matter how much outward venting you give it (or what type
of outward venting you have - box vs ridge).

If someone is claiming that box vents can perform some sort of magic and
overcome a deficiency of soffit intake venting, and that a ridge-vent
can't perform this same magic, then get them to explain this magic to
you.