There’s no technical reason an iPad can’t run full-blown MacOS or even Linux & Windows; Apple just locks down the hardware to prevent it. I dream of one day having strong enough right-to-repair protections that companies won’t do that anymore and we’ll be able to install whatever we want on the equipment we’ve purchased, but I’m also not holding my breath for it.
$130 menu price but regularly goes on sale for $99. Still not cheap (especially compared to the “free” ad platform built in to the TV) but lessens the sting a bit. And much less likely to be abandoned by its manufacturer and get exploited.