The small display and compact form factor of the BK-7m would make style creation a challenge. It was bundled with software that allowed users to create styles on a PC. But the software was clunky, it looked like Windows 3.1. And it also didn't permit addition of the "Alteration Mode" parameter that was added with G-70 OS v2 (and this parameter does contribute meaningfully to the overall style quality.) Bottom line, the E-A7 does everything you mentioned, although the sammpler has limited memory.

I think the BK-7m is great for what it is. I might go caroling this winter with a keytar, and wear one on my hip! Wouldn't want to do THAT with an RA-800 or Ketron Audya!!