Case in point: OSM editors. iD has very low barriers to entry: it's all in-browser, integrated with the website, nice rounded corners, and no dependencies - but it's slow and unable to keep up with edits > 500 nodes (because it's a memory hog built on a memory-hog JS framework running in a JS+DOM memory-hog virtual machine inside a memory-hog application). JOSM, on the other hand, is not quite native (Java being a memory hog of its own), but is capable to use persistent caching and relatively efficient memory structures. (I'm explicitly not comparing the feature set, which stems from different usecases or ease-of-use, which is somewhat subjective: this is in comparison of rudimentary editing operations)