Main reason, I already stated. If you listen to ALOT of music off your HT, you'll definitely want two great L/R speakers and you'll have more budget for it.
Living room center channel speaker placements are universally terrible as well. Often low and flush in a nice centerpiece furniture and horizontal, instead of the ideal vertical on a stand. Living rooms also are MUCH smaller than theaters, so you really don't need that many speakers to recreate the same sound environment. Yes, sound mixers make slightly different mix for video releases. However with the AWESOME Dolby Atmos/DTS:X object based codecs, the difference of mixes will disappear. If they want, they can give us the same exact mix and the receiver will process it down to the amount of speakers and where they are located in your home. It actually more matches what 3D video games have been processing audio since Quake I.
Additionally last 10-15 years, power from your typical AVR is beyond weak. Luckily if you use it to power one less speaker, you'll be getting more power and power headroom for your other speakers. The other side of that argument is the center speaker is where most of the sound is and without one you'll instead be powering two speakers to play the same content instead of one.
However if you have a better half there's no argument. Be happy she's even letting you have HT speaker setup... so show some love back and go no center channel.
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