Chain hanger story is pretty wild, but it's under a different loading than an eyelet. I don't fully trust brazed on eyelets. Never had any experience with one breaking off though. And some dropouts have horrible detail on the built in eyelets. I recently built a fork with such dropouts and beefed up the eyelets with brazing filler. On one bike, I put hourglass style rack mounting bosses down by the dropout. If it's possible a lot of weight is going on the eyelet, that's a pretty safe bet.

I only use the traditional chain hangers for rinko-style hangers. Never would leave the chain on one of those. I use Columbine qwickchainger for a regular chain hanger.