The easiest way to link to other iNaturalist resources (observations, taxa, etc) is to just paste in the full URL. This causes issues with affiliate sites (of particular interest to me now that https://inaturalist.ala.org.au/ is online). The solution is to manually create relative HTML URL’s, which is a bit cumbersome.
Ideally it would be good to automatically recognize either partial links (this would not be retrospective) or to adjust full URL’s to partial/relative ones. I assume the current conversion to URL happens at time of submitting the text. Having links dynamically adjusted would obviously work differently (and create more server load) so I don’t know if its reasonable. Additionally, most people only use the one gateway and don’t really care about such issues.