If you filter coffee through a paper filter then there are negligible health benefits to drinking coffee which are probably more than offset by the caffeine.
If you don’t filter it through a paper filter then the cafestol probably negates the benefits before you have to weigh them against the negatives of the caffeine.
Could you be more specific about the negligible health benefits of coffee and the downsides of caffeine? As a regular coffee drinker, I've done some searching to try and gauge the long-term risks of consuming ~100-200mg of caffeine per day, and couldn't really find anything. The medical sources I've seen basically say the long term risk is practically non-existent unless you have a specific sensitivity to caffeine, but I'm curious if you've seen something different.
It's linked to increased blood pressure, increased risk of heart disease, kidney problems, etc, but as you mention there's not anything rock solid and there's also relatively recent studies that show positive effects.
For people that intake less than 400mg a day.
That's the tricky bit. Do you know how many mgs of caffeine you take in on a daily basis?
Right, yeah that's sort of the conclusion I've reached - sort of a "correlation may not imply causation" type situation.
I drink one 300g cup of coffee a day, except on very rare instances where I'll have like two or three cups in a day. My average daily caffeine intake is probably around ~100mg, which is well under any demonstrably dangerous limits that I've seen.
I’m not a doctor nor am I an expert, so hopefully not being taken as an authoritative source here, but my understanding is similar to yours regarding caffeine.