The only big thing it cant do is Av1 streaming, and its not really mainstream yet. The only possible upgrade would be a mini pc setup as an htpc, but then you’re giving up android tv. And I don’t think they can stream av1 yet. Afaik there arent any better arm based android tv units on the market than the shield tv. Im planning on changing out my shield tv for an htpc someday, especially now Nvidia has dropped gamestream. Android tv is a headache, and id rather deal with just linux/kodi at this point.