That, and that no-one ever brought out anything better (for what I do with it!)... LOL
Actually, I did get some new arrangers last year or so. A BK-7m, but that was primarily used to replace the ancient MGS-64 rack module as a sound source for my KX-5 keytar rig, and then the BK-9, which adds everything I have wanted for my solo gig for a long time (chord sequencer, audio loops, MP3 playback) to the already great G70 soundset, and threw in some nice SA type sounds too.
Both the new things have yet to gig much, but I doubt either one will get replaced in the usual 8-10 year timeframe I try to keep things working for. The MGS-64/KX-5 has been in regular use for nearly 20 years! At my age, I may now be getting to the point of having my LAST new gear as long as it remains mechanically reliable.
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An arranger is just a tool. What matters is what you build with it..!