This is a bad idea, because they could include spyware in future security updates. It's entirely possible for them to backport antifeatures into existing products.
I agree, though I also think it's a bad idea because you're injecting money into Amazon for potentially breaking a good piece of hardware. It might encourage them to acquire products just to reap the benefits of that sweet "Amazon is about to ruin our product - so get a copy now!" sales boost.
I can't imagine such of an effect ever being large enough to factor into any sort of decisionmaking. But there are plenty of hardware-focused companies which make mesh Wi-Fi hardware that are less likely to get swallowed up anyways.
ASUS' AiMesh in particularly neat because it got backported to a bunch of compatible hardware platforms, and rather than being limited to particular "beacons" which tend to be sparse on things like external antennas and Ethernet support, it works with full-fledged Wi-Fi routers.
Users are getting legitimately fatigued of buy outs lowering quality, there are quite a few people I know who will treasure their full metal-chassis thinkpad until the day they die.
And I sort of agree... I'd only expect technically literate people to exhibit this buying motivation, but is the mass market Eero appeal significant enough that their consumer base isn't entirely tech literate people? Apparently this device has done rounds on podcasts but I'd never heard of it before today.