Hi Diki

You make some valid points from a US perspective, however sales of arrangers in the US are minute compared to Europe & Asia, thus US views have no relevance to manufactures (When was the last time something suggested by a US player was added to an arranger).
The closest to the US is probably the UK (Which itself is quite different from the rest of Europe) however this still deviates a lot from the US.

BTW. The main design centres for Western style (Voiced) arrangers are Germany and the UK, and they have a completely different outlook to the US.

Bill