Nothing wrong with the motorcycle rack approach. Overkill is usually a good thing. It might be able to function as a bumper, resulting in less damage to your bike.
Swagman will fail in an accident? Which bike type rack won't fail, if you get smacked from behind? I totally agree there are better bike racks. I can't report on how good they are, because my swagman just keeps on going.
As for just breaking on it's own, I can only report that my swagman has carried two ebikes at a time for years. I got it in 2008. It's really rusty and crusty now, but no sign of it failing. The wheel loops have bent down, but the only failure so far, was having a J hook shake off while driving without a bike on the rack, and some of the quick pins have been replaced with bolts. I most often use the rack to carry my dirt bike to the trail head. The last mile of the road to the parking spot is nasty, 4x4 type road with no grading ever. So it bounces hard in the whoops that last mile every trip.
Steel, cheap, strong, repairable. My early version swagman did have one big flaw, It carried the bikes too low. This resulted in the exhaust melting tires on trips longer than 50 miles. I welded an extension on the hitch mount part of it, which raised it 2" permanently curing the problem. Current models carry it higher.
Very easy to load a bike, just place one wheel at a time in the wheel holders. So my 90 pound bike, I only lift 45 pounds at a time.