All your experience and preparations (and a bit of luck) paid off in a safe, and no doubt joyful, arrival. Congratulations.

I think the lesson to be learned is that we all are subject to the infamous "getthereits." The desire to arrive at our planned destination on time as planned subtly distorts our judgments of risk. I got the impression from your post that you were already having a bad feeling at your decision point, but your checking of all the reports convinced you that it was OK to go on despite that bad feeling. Every time I've ignored those feelings, I've gotten into trouble.

My winter driving philosophy is that no matter how capable my car, how skillful I am at winter driving, I am no match for those who don't know what they are doing, cause an accident and stop traffic dead. You can't dive over the cars in front of you or, in many cases, even turn around. You are simply trapped there for the duration. Happily, you avoided that.