And at least they're not owned by some venture capitalist who flogs everything off when the whole thing doesn't hit a specified return, or when they get bored and want to invest in something else.
It doesn't matter what kind of company owns the brands. It's totally immaterial. McIntosh proved that - when Bose took it over everyone and their dog pretended to care and thought the sky was falling - but that was the FIFTH time McIntosh has been bought over.
Also, while under Masimo, B&W still released new speakers and products to acclaim - no-one can argue with their Mk3 600 and 700 series speakers, and their new PX7 S3 headphones are being met with great enthusiasm as well. Admittedly they have failed with their soundbar and wireless speaker range - but that was of their own doing, and had nothing to do with ownership.
There's been attrition within Harman itself too. Boston Acoustics is dead, but again, that was their own fault for lacking in new products, and retaining hopelessly ageing and mediocre speakers.
For example, I will almost never buy a Sony AV product. The way their TVs and disc players handle Dolby Atmos is atrocious - needing almost always manual intervention to switch.
You also talk about IAG, well their latest releases have been very mediocre as well - the Quad 33 and 303 is little more than a misguided exercise in nostalgia. Audiolab, who otherwise make excellent products, have decided at the 11th hour to revive pre/power seperates. And from what I've read you're just better off getting the 9000A integrated instead of the 9000Q and 9000P combo, and save a few bob too.