The simplest answer is yes,... of course ...
BUT, doesn't it depend on the venue, what the audience is looking for, what type of music is desired, and other factors? ... If a venue - and its audience - is only looking for solo piano music, whether it be 'cocktail' music, semi-classical or classical, or jazz, then an arranger might be over kill ... For a good number of us, however, the need is to supply more than solo piano music without the additional cost of other musicians, so the arranger kb is ideal ...
JMHO