Audiophile solution: Get rid of the curtains. The harder solution: Convince the spouse that both sides of a room should have similar acoustic properties and create a design that takes asthetics and acoustics into consideration.I agree. Altering room treatments can be very helpful for acoustics. Unfortunately, many audiophiles share living space with spouses/partners/roommates who are less than eager to sacrifice room aesthetics for room acoustics. Even if they're okay with it, changing room decor can get expensive (at least compared to the price of a HP) pretty quickly if one isn't careful, and room shape will remain a limiting factor.
What I would like is a serious review of the HomePod under acoustic conditions. One simple test: A room with heave curtains, HomePod vs. optimised traditional setup, and then you open all the curtains and see if HomePod adapts.