"The fully encased S2 system makes board-level repairs impossible."
you cannot be serious.
The improved reliability afforded by the resin encasement is vastly more important that the tiny probability that anyone would ever successfully perform a board level repair, even without the resin.
If you expect your watch to go 3 years between battery charges, you're not going to get it with a smartwatch.
If you put your watch on the night stand / charger each night then the battery on the first generation was just fine. Mine still runs for about 43 hours.
Tearing down Samsung products is too dangerous. They explode.
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