It was the 4-foot minimum focus distance that struck me as impractical rather than the weight (though I’m happy to have something a bit lighter).
Apart from sometimes needing to move/manipulate leaves or branches to get a clear view of the subject, for stuff in the under 5 mm range, a lot of the time I need to be closer than 1 meter even to just tell whether that dark thing on a leaf is an ant, a tiny beetle, etc. or just a bit of debris, and decide whether I want to photograph it or not. But maybe that is my near-sightedness and others do not have this difficulty.