if a room boosts a frequency by a room mode you can change the room. To change the living room to an anechoic chamber will certainly help.
But what if the spouse does not like to live in an anechoic chamber?
Is it better to leave the "neutral" speaker untouched or is it better to reduce the critical frequency by a filter? Of course the latter solution must be a fool's errand as it changes the neutrality of the speaker. I guess that the fool will not take care about this but enjoy the better sound.
By definition, room mode problems lay below the transition frequency (i.e. below around 300 Hz). No-one here is disputing that EQ'ing a speaker is beneficial below the transition frequency - we are all in violent agreement here, and that position has strong support from many studies. Above the transition frequency however, the deviations are smaller and the human auditory system is better equipped to separate direct sound from reflected sound, which is why this approach is ill-advised at such frequencies.