I guess one good reason might be they don't sell to airlines dominated by accountants.
They don't sell to 'anybody' period - I mean their commercial aircraft industry is so tiny it doesn't count. If not for Sukhoi-100 all their civilian transport category aircraft made in 2014 could be counted on two hands. SSJ-100 is their only real seller, by the way Sukhoi-100 has a cockpit crew of two - because this is what (real) customers expect and Thales provided avionics to make it possible. 97% of all aircraft operated today by Russian airlines are western made.
Any opinions on this? Do you think it's a help or hindrance?
It definitely doesn't help. Whether it is any significant hindrance - probably doesn't matter since their aircraft are so noncompetitive in many other ways.