>>43069818Yes and no.
>built-in non-latent upscalers1. Which ones, exactly? Denoising strength matters. 2. As a hi-res fix upscaler, or trying to "upscale" with img2img, or after the fact entirely in "Extras"? That also makes a difference. That last one will add practically no detail at all.
3. They do, but it varies depending on which one. Latent still does that "the most". But they will still add detail. This is the image you replied to before lollypop at 0.5 denoising strength and 2x. Plenty of detail added IMO.