I think that Infinite Scroll is useful; but a cheap trick in most implementations.
If used properly, it creates an endless amount of information that the user can dive into for long periods of time.
If used improperly, a user like yourself may feel like the site is intentionally trying to fluff up and abstract it's content from the end user.
I do think that your tips for avoiding stress points are very useful and other developers should take note for their implementations.
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