I probably don't want to know, but what are those long term downsides you mention if an engine partially seizes?
Firstly let me say that you may not have had a partial seizure so I'm not trying to "doom prophet" the thing. But . . .
What happens is that a partial seizure generally causes the pistons to "pick up" on the barrels, sort of starts to weld themselves to the barrels of the cylinders. This condition cannot go away. If it's there it will either stay as it is or it will probably get worse as the rings start to clog with bits of the melted metal.
So if it did partially seize there is a fair chance it will start to sound a little rattly, commonly called piston slap. As the rings clog there will be a loss of compression, black smoke from incomplete combustion, loss of power, difficult starting and so the list goes on.
You may not experience any of the above if you're lucky and you also may not experience all of them. Just be conscious of the symptoms because if they start to manifest themselves you may be advised to act sooner rather than wait for a catastrophic failure.
Good luck. I hope there is another reason for the engine "quitting".
PS. In my experience overheating unless its really severe won't affect the bottom end (crank, bearingss, etc), it is generally in the cylinders where the heat is generated, not in the crank case.