I bought an older home, and the dryer exhaust in the laundry room vents directly into the garage (cutting a hole to route it outside, either in the laundry room or garage, has been on my list of things to do...I've temporarily rigged up a lint bucket where it comes out in the garage).
Meanwhile, I'm also looking at setting up some genuine dust control for my growing shop, which is also in the garage.
Is there any reason why I wouldn't vent everything outside together? Bring the ducts for both the DC and dryer together at the wall exit? It certainly seems like it would work, but I wonder whether there's anything I'm overlooking.