Link posts turn each of your RSS feed sources into their own editorial curation board, offering you glimpses into corners of the internet you may not be exposed to otherwise.
There’s no right or wrong way to do this, and I’m not suggesting that people who share links without commentary are committing some sort of crime against the indie web. However, if you’re going to share new ideas and experiences with someone, it seems courteous to do so with the same care and attention you’d grant them if you were making the recommendation in person.
I’ve published more than my fair share of link posts without any additional commentary, but it’s something I try to avoid as much as I can. It’s much more courteous to add a bit more context about what the link is, why I’m sharing it, and/or any thoughts I have regarding the overall topic.
There are occasions where the blockquote speaks for itself or the commentary is provided within the title, but those are the exception, not the norm.