Neither of my kids were interested in going to grad school at least not right away. So there undergrad institutions were important for their first jobs. I had an undergrad degree from Harvard and a grad degree from Columbia. When I was job-hunting in Munich, Germany guess which one they were impressed by? (They didn’t know there was no undergrad architecture school at Harvard.)
I think moderate freakouts about grades are understandable, but the truth is if the rest of the application is there, there are lots of schools that will over look some Bs - especially if they are in what they perceive as hard subjects. My younger son had straight B’s in Latin, a B in Honors Chem freshman year, a B+ in pre-calc and I’m pretty sure a bunch of English B+s and still got into top ranked in the top 30 of USNWR.