I have to say, I totally agree with Mark on the importance of playing live LH bass.
I, like Mark trained as an accordionist, I love the accordion to this day and I still play the odd accordion gig. However I also like pop, jazz and all types of good music and moved to an X5 portable Hammond organ ( late 70s early 80s) playing bass pedals thro a bass amp with a rotary speed speaker on upper keyboards. Late 80s the Dx7 etc arrived, I then moved to synths and for the next 20-25 yrs played top 40 music in bars with
guitar and drums playing manual LH bass (great times).As the scene changed I bought an arranger (Tyros1)and got work with a singer doing mature social clubs. Forward to June 2017,sold my G70 bought Privia (Casio)piano, different scene now,freelancing with drummers mainly,the odd standin work. Playing piano with split bass and... yes.. LH bass, great sound, loving it. I still use my BK7 with midi accordion and I may use it with a master keyboard if the need arises. I do love plaing again with live musicians, as they say "it's where it's at".
Arrangers? a musicians tool or hobbyist's toy? it is part of our evolution as gigging musicans but not the be all and end all.