Terribly sorry to hear of your "frustration"
Yes, rear main seal failure is common for this 2.4 liter engine in winter conditions.
You are correct, a horrible design from GM.
AND GM stopped making this engine.
If only you came to this forum last month, your "frustration" would have been prevented, clever "addidas" found the solution last year.
Could you tell us your details,
the Temperature, your speed , rpms, how long you were driving?
Crankshaft rear main seal failure can be easily prevented,
By purchasing the $80 c-f-m oil cap
And swapping out the OEM oil cap for the $80 cfm oil cap.
On this forum, last year, the brilliant "jaytee" identified the failure mode of crankshaft rear main seal failure in cold weather....
JayTee explained ^^^^^.....
I explain..... ==>
When the dirty side internal PCV orifice which is just an 80 thousands of an inch diameter hole on the plastic molded nylon intake manifold
When the hole in the plastic is gunked up plugged with cold engine oil and crankcase gasses sludge, and even frozen water vapor crystals(ice)
( which is very common, even normal, yes, very normal in cold weather)
When the clean side PCV breather orifice hose freezes ( which happens when it is very cold out side)
Piston blowby (from worn piston rings, also normal, and especially from ecotec engines manufactured before may 2013)
Then Piston blowby during wide open throttle (WOT) creates high crankcase pressure .....
The Result of high crankcase pressure because pressure can not vent thru plugged dirty side PCV orifice
Nor can crankcase pressure vent thru frozen cleanside PCV breather hose
Then crankshaft rear main seal failure occurs
The crankcase pressure blows a hole through the viton (plastic) crankshaft rear main seal.
along with its disastrous after effects as when oil is pumped out of car onto the road thru this hole in the seal.
Last year, JayTee came up with a creative home made oil cap to address the problem!
about Christmas 2018, the clever "addidas" discovered the commercially available $80, cfm oil cap ,
and tested it on his equinox. Checking fuel trims, and in ice cold minus 10 degree weather, It worked perfectly!
Now, I run the cfm oil cap on my cars.
The cfm oil cap, with the one way vented, with nylon ball seal, prevents rear main seal failure, it gives a 3rd path for crankcase pressure to escape from your engine even when the PCV system fails.
It keeps crankcase pressure very low which is great to help your piston rings seal better
and helps the oil control ring "squeegee" oil of cylinder walls
And keeps crankcase gunk out of your cleanside PCV breather hose.
12gmcterrain, you were clever enough to stop driving.
Some folks don't, and then the engines become junk.