I don't think I'm allowed to punch holes in the walls as would be needed to run Ethernet.
As a point of curiosity: Typical wifi is now faster than typical ethernet. I did benchmarks. Although both my computer and router advertise gigabit, they typically negotiate to 100M. I tried swapping cables, so it's not just random cable issues. Wifi gives consistently higher speeds than ethernet. Of course, 100M is plenty, and as you point out, does give better reliability.
> However you are also taking on the effort of upgrading things yourself as necessary to maintain security.
That's my concern. Cost of maintenance becomes astronomical. I'm not a sysadmin by trade, and I'd need to stay on top of zero-days and similar. Plug-and-forget is nice.
I'm comfortable with the middle ground of trusting the vendor, so long as they say they're not monitoring things and they're reasonably credible. Thing is, most vendors seem to advertise cell phone apps, Alexa integration, and other stuff which necessitates sending my privates all over the web.