I can’t tell you how many times I’ve been burned by the user interface in the manual location geotagger when uploaded a new observation (https://www.inaturalist.org/observations/upload). (I know, I know: fool me twice, shame on me. I’m a slow learner; what can I say.) You zoom, zoom, zoom, zoom from the world all the way in to your location, find the right spot, drop a pin, adjust the precision circle – and then click the “close” x in the top right to dismiss the pop-up map pane. Gotcha! You’ve just lost all your work and have to start again because you forgot to click “Update Observations.” A better user interface would be for any pin to be saved automatically unless the user clicks “Cancel.”
I geotag manually a fair bit, whether it’s because I’m entering old obs that don’t have exif geotags or because I’m entering ones taken at home – I turn off camera geotagging there for privacy and offset the location manually (too much to go wrong otherwise). So it really is important to me for that user interface to work well.