Yeah, this is convenient for not having to swap cables, but for pure image quality it’s almost certainly better to just run older consoles through a good RetroTINK with upscaling. I bought a (somewhat pricey) Dreamcast HDMI mod that I’ve yet to install, but may just end up using a RetroTINK 4K instead, once that’s released.
But I’m still tempted. Even though I’ve had the HD cables for it since I bought the system.