I’ve shipped luggage multiple times, even right to a hotel, and never had a problem.

Check out PirateShip.com, they have significant discounts on UPS and USPS. I always just tape the label right to the suitcase, drop it off, and it works fine - much less lugging.

Maybe I’ve been having bad luck but my wait times for checked baggage have been really long lately - yesterday was around 45 mins at SFO. So, if you shipped you’d get all that time back (plus extra check-in time, etc).