At any case, Lilith must not delete any heroes. Every of them have fans,dropping them will make some people unhappy. Yes, old heroes must be reworked, its give a good results. I didn't see Arachna before reworking, but now she is quite strong. This must doing to some heroes now...
(And what i want to say... Before comparing Boomer with Arcturus or Caneq, you must not forget that they more complicated to get than Boomer. In that case, for newcomers he is good enough.)