A lot of them are spot heights transferred from out of copyright maps, and don’t belong in OSM as natural=peak. I’ve removed or retagged some based on survey but there are probably 1000s more in the UK where I am.
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Indicating that an islet has even a small peak is important: 2017 Irish Coast Guard Rescue 116 crash - Wikipedia
How do you tag the spot heights? Not that I anticipate adding any.
you can add ele=* to any node
I know, but what should the primary tag be for a spot height? It’s not a feature like a post box or rubbish bin, but potentially verifiable.
there is no need for a primary tag other than ele, if all you want to tag is the elevation of the point.
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OSM isn’t the correct place for fine grained height data. It’s neither the intended purpose of OSM, nor is it really supported by the data model. It also doesn’t need to be; OSM isn’t the only geoinformation database in existence and combining information from multiple source databases is absolute standard practice. Every map with hillshading does it. Even the most rudimentary DEM (Digital Elevation Model) is going to be more useful than an elevation tag on a few random points in OSM.
There is absolutely no way we can represent this information in OSM, nor should we attempt to because it simply doesn’t belong here.
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Sure, nevertheless indicating the highest point(s) on an islet with ele= is fine (adding natural=peak only if it makes sense).