Error when updating your profile (08 Sep 2018)
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Not sure if it means anything, but Roland's own site still lists the E-A7, BK-5, BK-7m, etc., under "Arrangers." Only the BK-9 and GW-8 are no longer listed as current models.
The problem with recording to the Song Recorder is that it very much depends on how clean and empty your stick is. My gig USB stick has thousands of SMF's, Styles, Mp3's etc., and it struggles to get a clean recording to .wav without dropouts. A stick with much less on it might be less prone to dropouts, but to be sure and safe, I think it's better to record to something like a little Zoom pocket recorder at your gig, and to a computer at home, as they offer FAR more control than the built-in, one-shot audio recorder in the arranger.
I like to use the headphones out to record to and the main outs to the PA when recording my gig.
The main issue recording on the BK series was, you had to start at the beginning and do the entire take perfectly all the way to the end. No way to punch in on a later section, etc..
All in all, if you are posting here, you already have a computer that is FAR better as a recorder than the built-in recorder in the arranger..!
And no, the E-A7 is still a current keyboard in Roland's line-up. It has a VERY different architecture to the BK series, so expecting everything from the BK's to still be the same isn't really realistic.