I agree with your observations on the Roland G-70, E-80 and BK-9.

I have the E-80. I like the key action. Inclusion of the on-board speakers and metal casing made this into a massive 49lb beast. It is built like a tank.

Roland addressed the weight problem with the BK-9 and added many of the sought after features that you pointed out.

I was disappointed to see Roland bow out of the portable arranger market. The Atelier AT-900EX was their flagship model in the home organ market introduced in 2007. Roland discontinued the Atelier line in 2015.


https://www.roland.com/global/products/AT-900/


Technics was once a leading manufacturer in the home organ and portable arranger market.
I think the biggest reason for their demise was not the lack of innovation by Technics engineers but rather the greed of the Technics dealers.

Back in those days, Technics allowed their dealers to charge whatever price they wanted to their customer base. The Technics dealers raked in enormous profits from their loyal customers. It spiraled out of control.

Korg seized on this opportunity. Their introduction of the Korg i3 which they called a Professional Arranger with an excellent set of voices and styles at down to earth prices with a set MSRP marked the end of price gouging by Technics dealers.

Customer who wanted a portable arranger now had a cheaper yet feature rich alternative.

The Korg i3 set the stage for the long list of competitive products that followed it.