I have always thought/believed/understood that the chord chart with extensions is meant to be a sort of chord melody notation system. If I've read the history correctly, those tin pan alley musicians were pretty fluent and it came easily to them. At this point, It fits the term "arcane" pretty well...and it doesn't always work. Not every fingering has a sensible chord name. Cold hard fact of 4-string life.
Of course, just about every Uke book uses fret-string diagrams. I tried that for a while but I found it awkward. Those ink stamps go on crooked and not on a line. An elephant-in-the-room problem with them. I prototyped a couple alignment jigs but just too much of a production. Pre-printed fret-string stickers sort of work but the only ones I could find were too big ( to fit over a standard treble staff ) and, again, hard to stick on in a clean, straight line. I've thought about printing them out on mailing labels, but there you go again with a big production.
In summary ( for me ):
chord names with extensions --- arcane
chord diagrams --- tiresome
Next idea ?